previndexinfonext

code guessing, round #56 (completed)

started at ; stage 2 at ; ended at

specification

hello! the problem is to reverse-engineer a regex. submissions may be written in any language.

there are no backreferences or lookarounds here. just plain regular expressions. to be precise, the set of valid expressions, along with the sets of strings they recognize, is as follows:

if A and B are valid expressions, the following are as well:

the above rules are listed in order of precedence, such that f|oo* is equivalent to (f|(o(o*))). note that the empty string is considered to have the same precedence as concatenation and is not targeted directly by the Kleene star; * is an invalid expression and must be written as ()*.

your challenge, given a valid string representing a regex that recognizes at least one string, is to compute any one string that the pattern recognizes. if it recognizes multiple strings, you may pick any one. as any language is allowed, there is no fixed API.

consider using regexdiff for examples.

results

  1. 👑 Dolphy +6 -0 = 6
    1. yui
    2. cdr sa (was LyricLy)
    3. kotnen
    4. at
    5. kimapr (was luatic)
    6. LyricLy (was Proloy)
    7. soup girl
    8. moshikoi (was cdr sa)
    9. taswelll
    10. luatic (was kimapr)
    11. olus2000
    12. Proloy (was moshikoi)
  2. luatic +3 -1 = 2
    1. yui
    2. taswelll (was LyricLy)
    3. moshikoi (was kotnen)
    4. cdr sa (was at)
    5. LyricLy (was Proloy)
    6. at (was soup girl)
    7. Dolphy (was cdr sa)
    8. Proloy (was Dolphy)
    9. soup girl (was taswelll)
    10. kimapr
    11. olus2000
    12. kotnen (was moshikoi)
  3. kimapr +3 -2 = 1
    1. at (was yui)
    2. LyricLy
    3. Dolphy (was kotnen)
    4. cdr sa (was at)
    5. luatic
    6. Proloy
    7. kotnen (was soup girl)
    8. moshikoi (was cdr sa)
    9. soup girl (was Dolphy)
    10. yui (was taswelll)
    11. taswelll (was olus2000)
    12. olus2000 (was moshikoi)
  4. kotnen +3 -2 = 1
    1. yui
    2. taswelll (was LyricLy)
    3. at
    4. Dolphy (was luatic)
    5. soup girl (was Proloy)
    6. Proloy (was soup girl)
    7. cdr sa
    8. moshikoi (was Dolphy)
    9. LyricLy (was taswelll)
    10. luatic (was kimapr)
    11. kimapr (was olus2000)
    12. olus2000 (was moshikoi)
  5. LyricLy +2 -1 = 1
    1. yui
    2. at (was kotnen)
    3. moshikoi (was at)
    4. kimapr (was luatic)
    5. cdr sa (was Proloy)
    6. taswelll (was soup girl)
    7. Dolphy (was cdr sa)
    8. Proloy (was Dolphy)
    9. soup girl (was taswelll)
    10. luatic (was kimapr)
    11. olus2000
    12. kotnen (was moshikoi)
  6. moshikoi +2 -1 = 1
    1. kimapr (was yui)
    2. taswelll (was LyricLy)
    3. yui (was kotnen)
    4. Proloy (was at)
    5. LyricLy (was luatic)
    6. soup girl (was Proloy)
    7. Dolphy (was soup girl)
    8. cdr sa
    9. at (was Dolphy)
    10. kotnen (was taswelll)
    11. luatic (was kimapr)
    12. olus2000
  7. cdr sa +3 -3 = 0
    1. yui
    2. Dolphy (was LyricLy)
    3. kotnen
    4. taswelll (was at)
    5. LyricLy (was luatic)
    6. Proloy
    7. at (was soup girl)
    8. moshikoi (was Dolphy)
    9. kimapr (was taswelll)
    10. luatic (was kimapr)
    11. soup girl (was olus2000)
    12. olus2000 (was moshikoi)
  8. Proloy +2 -2 = 0
    1. at (was yui)
    2. cdr sa (was LyricLy)
    3. LyricLy (was kotnen)
    4. Dolphy (was at)
    5. yui (was luatic)
    6. taswelll (was soup girl)
    7. soup girl (was cdr sa)
    8. kotnen (was Dolphy)
    9. kimapr (was taswelll)
    10. luatic (was kimapr)
    11. olus2000
    12. moshikoi
  9. at +1 -3 = -2
    1. moshikoi (was yui)
    2. Dolphy (was LyricLy)
    3. taswelll (was kotnen)
    4. olus2000 (was luatic)
    5. kotnen (was Proloy)
    6. soup girl
    7. LyricLy (was cdr sa)
    8. cdr sa (was Dolphy)
    9. kimapr (was taswelll)
    10. luatic (was kimapr)
    11. yui (was olus2000)
    12. Proloy (was moshikoi)
  10. taswelll +0 -2 = -2
    1. at (was yui)
    2. cdr sa (was LyricLy)
    3. Dolphy (was kotnen)
    4. kimapr (was at)
    5. kotnen (was luatic)
    6. luatic (was Proloy)
    7. LyricLy (was soup girl)
    8. moshikoi (was cdr sa)
    9. olus2000 (was Dolphy)
    10. Proloy (was kimapr)
    11. soup girl (was olus2000)
    12. yui (was moshikoi)
  11. soup girl +0 -2 = -2
    1. cdr sa (was yui)
    2. olus2000 (was LyricLy)
    3. Dolphy (was kotnen)
    4. kotnen (was at)
    5. LyricLy (was luatic)
    6. kimapr (was Proloy)
    7. at (was cdr sa)
    8. moshikoi (was Dolphy)
    9. luatic (was taswelll)
    10. yui (was kimapr)
    11. taswelll (was olus2000)
    12. Proloy (was moshikoi)
  12. olus2000 +2 -5 = -3
    1. Dolphy (was yui)
    2. Proloy (was LyricLy)
    3. soup girl (was kotnen)
    4. moshikoi (was at)
    5. yui (was luatic)
    6. kotnen (was Proloy)
    7. LyricLy (was soup girl)
    8. cdr sa
    9. at (was Dolphy)
    10. taswelll
    11. luatic (was kimapr)
    12. kimapr (was moshikoi)
  13. yui +2 -5 = -3
    1. olus2000 (was LyricLy)
    2. Proloy (was kotnen)
    3. at
    4. LyricLy (was luatic)
    5. soup girl (was Proloy)
    6. taswelll (was soup girl)
    7. Dolphy (was cdr sa)
    8. moshikoi (was Dolphy)
    9. luatic (was taswelll)
    10. kimapr
    11. cdr sa (was olus2000)
    12. kotnen (was moshikoi)

entries

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entry #1

written by yui
submitted at
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index.js ASCII text
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function generate(str,maxRepeat=10,inner=0,i=-1,r=[],o=r,_,ch,f=o=>o.map(x=>(typeof x=="function"?x():x)||"").join("")) {
  for (;ch = str[++i];) {
    if (ch == ".") o.push(() => String.fromCharCode(~~(Math.random() * 93 + 33)));
    else if (ch == "\\") o.push(str[++i]);
    else if (ch == "(") [_,i]=generate(str, maxRepeat, 1, i, []),o.push((_=>()=>f(_))(_));
    else if (ch == ")" && inner) return [r,i];
    else if (ch == "|") o.push(((a,b)=>(o=a,(x=f(a),y=f(b))=>Math.random()>.5?x:y))([],o.splice(0)));
    else if ("*+".includes(ch)) o.push(((_)=>f(Array(~~(Math.random()*maxRepeat)+(ch=="+")).fill(_)))(o.pop()));
    else if (ch == "[") {
      for (s=[],o.push((r=s[~~(Math.random()*s.length)])=>r&&String.fromCharCode(~~(Math.random()*(r[1]-r[0])+r[0])));(ch=str[++i])&&ch!="]";) {
        if (ch == "-" && s.length && str[i + 1] != "]") s.push([s.pop()[0], str.charCodeAt(++i)]);
        else s.push(Array(2).fill(ch.charCodeAt()));
      }
    } else o.push(ch);
  }
  return f(r);
} // only 17 lines! (637 chars minified)

entry #2

written by LyricLy
submitted at
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EVAL!!! FOR HONOR!!!.py ASCII text
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import re

class No:
    def __add__(self, _): return self
    __radd__ = __add__
    def __bool__(self): return False
    def __mul__(self, _): return ""

def hurt_knee(s):
    return eval('""' +
        re.sub(r"\\.|[^()[\]|*\\]", lambda m: fr'+"\{c}"' if (c := m[0][-1]) in r'\"' else f'+"{c}"', s)
            .replace("(", '+(""')
            .replace("[]", '+No()')
            .replace("|", ' or""')
            .replace("*", '*0')
    )

entry #3

written by kotnen
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.c ASCII text
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// taken from a prototype grep implementation. it never made it into mainline sadly, but i found it
// in the mailing lists. ive removed everything that isn't relevant to the cg (like compiling to dfa),
// and converted it to generate strings instead of matching them. ive also formatted it and severely
// stripped it down (as you can see, now it's less than 50 lines)

#include<stdio.h>
#include <string.h>
#include<stdlib.h>

// Size of the buffer that this program will use.We dont want to go bigger than
// a page, for reasons. (Im not super-stitious, just a little stitious.)
#define BUFSIZE 4096

// Im use **argv instead of *argv[] to avoid the argument about
// array declaration/indexing syntax that keeps happining.i don't like argue
main(int argc, char ** argv){
        char * regex;
        char buf[BUFSIZE];
        _Bool slash=0, brace=0;
        int b=0, l=0;

        (argc != 2
                ? (printf("expected 1 argument, got %d", argc-1), exit(1))
                : (regex=argv[1])
        );

        for(int i =~ 0; ++i< strlen(regex); ){
                char c = regex[i];
                if(slash) buf[b++]=c+(slash=0);
                else if(brace)brace=(c==']' ?0:*(char*)0);
                else switch( regex[i] ){
                case '[': brace=1;break;
                case '\\':slash=1;break;
                case '(': l    ++;break;
                case ')': l    --;break;
                case '*':         break;
                case '|': b    =0;break;
                default:buf[b++]=regex[i];
                }
        }

        l++; // unmatched parens get special treatment
        while(l--) if (slash | brace) buf[b++] = '$';

        buf[b++]='\0'; // unveil our glorious creation.
        printf("%s\n", buf);
}

entry #4

written by at
submitted at
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at *known at the time as [author of #4]

it does terminate i swear


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sIllylIttleguy.rb ASCII text
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f=->s{s.gsub /(?<!\\)\(((?<z>(\\.|[^()|])*|\g<0>*)|\g<z>(\|\g<z>)+)(?<!\\)\)\*?/x,'\k<z>'}
i=->(n){loop{p=n;n=f[n];break if p==n};n;}
loop{k=Kernel.gets;k ?puts(i[k].gsub /\\(.)/,'\1'): break;}

entry #5

written by luatic
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sus.zig ASCII text
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                                 const std=@import("std");const ArrayList                 
                                 =std.ArrayList;const Doer=struct{                        
                                 const State=enum{Normal,JustTainted                      
                        ,Tainted,TaintedGroup,Ignore,};const SyntaxError=error            
                        .InvalidSyntax;buf:ArrayList(u8),stk:ArrayList(usize              
                        ),stateStk:ArrayList(State),state:State,concatBegin               
                        :usize,pub                     fn init(alloc:anytype)Doer         
                        {return Doer                  {.buf=ArrayList(u8).init            
                        (alloc),.                     stk=ArrayList(usize).init           
                     (alloc),.         stateStk=ArrayList(State).init(alloc),.state       
                     =.Normal,         .concatBegin=0,};}pub fn startConcat(self:         
                     *Doer)void        {self.eraseConcat();self.state=.Normal;}pub        
                     fn eraseConcat (self:*Doer)void                    {self.buf.shrinkRetainingCapacity
                     (self.concatBegin);}pub fn pushState               (self:*Doer)!void 
                     {try self      .stk.append(self                    .concatBegin);try 
      self.stateStk.append(         self.state);self                             .concatBegin
      =self.buf.items.len;}         pub fn popState                              (self:   
      *Doer)!void{self.concatBegin  =self.stk.popOrNull                          () orelse 
   return SyntaxError;self.         state=self.stateStk.popOrNull() orelse unreachable;}   
   pub fn taint(self:*Doer)         void{self.eraseConcat();self.state=.Tainted;}pub fn   
   bufChar(self:*Doer,c:u8)         !void{try self.buf.append(c);}pub fn do(self:*Doer,   
   in:anytype     )![]const             u8{while(in.readByte())|c|{switch(self.state){.   
   Normal=>switch (c){'\\'=>           try self.bufChar(try in.readByte()),'|'=>self.state
   =.Ignore,      '*'=>{},'['          =>{if(try in.readByte()!=']')return SyntaxError;   
   self.state     =.JustTainted           ;},']'=>return SyntaxError,'('=>try self.pushState
   (),')'=>try     self.popState          (),else=>try self.bufChar(c),},.JustTainted     
   =>switch(      c){'\\'=>               {try in.skipBytes(1,.{});self.taint();},'*'     
   =>self.state   =.Normal,                                                '|'=>self      
   .startConcat   (),'('=>{                                                self.taint     
   ();try self    .pushState                                               ();},')'=>     
   {self.         eraseConcat                                              ();self.state  
   =.TaintedGroup ;},else=>                                                self.taint     
   (),},.         Tainted=>                                                switch(c)      
   {'\\'=>        try in.skipBytes                                         (1,.{}),'|'    
   =>self         .startConcat                                             (),'('=>try    
   self.pushState (),')'=>{                                                self.eraseConcat
   ();self.state  =.TaintedGroup                                           ;},else=>      
   {},},.TaintedGroup=>switch                                              (c){'*'=>      
   try self.      popState(                                                ),'|'=>{try    
   self.popState  ();self.startConcat                                      ();},'('=>     
   {try self.popState();self                                               .taint();      
   try self.pushState();},')'                                              =>{try self    
      .popState();self.state              =.TaintedGroup;},'\\'=>{try    in.skipBytes     
      (1,.{});try self.popState           ();self.taint();},else=>{try   self.popState    
      ();self.taint();}},.Ignore          =>switch(c){'\\','['=>try in  .skipBytes        
                     (1,.{}               ),']'=>return SyntaxError     ,'('=>try         
                     self.pushState       (),')'=>try  self.popState    (),else=>         
                     {},},}               }else|err   |{if(err!=error   .EndOfStream      
                     )return               err;}switch(self.state       ){.Normal         
                     ,.Ignore             =>return self.buf.toOwnedSlice(),else=>         
                     return                SyntaxError,}}};pub fn        main()!void      
                     {const stdout=std.io.getStdOut   ().writer();var bufout=std          
                     .io.bufferedWriter(stdout);const  stdin=std.io.getStdIn()            
                     ;var bufin=std.io.bufferedReader (stdin.reader());var arena          
                     =std.heap.ArenaAllocator.init                                        
                     (std.heap.page_allocator);defer                                      
                     arena.deinit();var doer=Doer                                         
.init(arena.allocator());try bufout.writer().writeAll(try doer.do(bufin.reader()));try bufout.flush();}

entry #6

written by Proloy
submitted at
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lyric.c ASCII text
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef enum {
    LIT,
    CAT,
    OR,
    NONE,
    END
} Tag;

typedef struct Ast Ast;

typedef union {
    char ch;
    Ast *children;
} Data;

struct Ast {
    Tag tag;
    Data data;
};

Ast create_lit(char c) {
    return (Ast){
        .tag = LIT,
        .data = 
            (Data){.ch = c}
        };
}

Ast create_seq(Ast* c, Tag tag) {
    return (Ast){
        .tag = tag,
        .data = 
            (Data){.children = c}
        };
}

void cleanup(Ast ast) {
    if (ast.tag != CAT || ast.tag != OR) return;
    
    Ast* children = ast.data.children;

    for (int i=0;children[i].tag != END; i++) {
        cleanup(children[i]);
    }

    free(ast.data.children);
}

void init(Ast *seq, int len, int cap) {
    Ast end = {END, (Data){ .children =  NULL}};
    for (int i=len; i < cap; i++) seq[i]=end;
}

void* expect_nonnull(void* ptr) {
    if (ptr == NULL) {
        fprintf(stderr, "Oh no, it looks like I got too hungry for yo computer... *smacks lips*\n");
        exit(EXIT_FAILURE);
    }
    return ptr;
}

int ensure_nuf_space(void** vec, int required_cap, int cap, int size) {
    while (required_cap >= cap) {
        cap*=2;
    }
    *vec = expect_nonnull(realloc(*vec, cap*size));
    return cap;
}

int parse(char*, Ast*);

int parse_next(char* input, Ast* ret) {
    if (input[0] == '(') {
        int c=0, i=1;
        for(; input[i] != ')' || c != 0; i++) {
            switch (input[i]) {
                case '(':
                    c++;
                    break;
                case ')':
                    c--;
                    break;
                case '\\':
                    i++;
                    break;
            }
        }

        input[i]=0;
        parse(&input[1], ret);
        input[i]=')';
        return i+1;
    }
    int offset = input[0]=='\\';
    *ret = create_lit(input[offset]);
    return offset + 1;
}

int parse(char* input, Ast* ret) {
    Ast end = create_seq(NULL, END);

    int len = 0, cap = 10, len2 = 0, cap2 = 10;
    Ast* seq = expect_nonnull(malloc(sizeof(Ast)*cap));

    Ast* ptr = expect_nonnull(malloc(sizeof(Ast)*cap2));
    seq[len++] = create_seq(ptr, CAT);

    int i=0;

    while (input[i]) {
        if (input[i] == '|') {
            seq[len-1].data.children[len2] = end;
            cap = ensure_nuf_space(&seq, len+2, cap, sizeof(Ast));
            i++;
            len2=0;
            cap2=10;
            Ast* ptr = expect_nonnull(malloc(sizeof(Ast)*cap2));
            seq[len++] = create_seq(ptr, CAT);
            continue;
        }
        
        Ast** currp = &seq[len-1].data.children;
        
        if (input[i] == '*') {
            cleanup((*currp)[--len2]);
            (*currp)[len2]=end;
            i++;
            continue;
        }

        cap2 = ensure_nuf_space(currp, len2+2, cap2, sizeof(Ast));

        Ast* curr = *currp;

        if (input[i] == '[') {
            curr[len2++]=create_seq(NULL, NONE);
            i+=2;
            continue;
        }

        i += parse_next(&input[i], &curr[len2++]);
    }

    seq[len-1].data.children[len2]=end;
    seq[len] = end;

    *ret = len == 1 ? seq[0] : create_seq(seq, OR);

    return i;
}

char* create_example(Ast ast) {
    switch (ast.tag) {
        case NONE:
        {
            return NULL;
        }
        case LIT:
        {
            char* a = expect_nonnull(malloc(sizeof(char)*2));
            a[0] = ast.data.ch;
            a[1] = 0;
            return a;
        }
        case OR:
        {
            Ast* children = ast.data.children;

            for (int i = 0; children[i].tag != END; i++) {
                char* segment = create_example(children[i]);
                if (segment != NULL) return segment;
            }

            return NULL;
        }
        case CAT:
        {
            int len = 0, cap = 10;
            char* res = expect_nonnull(malloc(sizeof(char)*cap));
            
            Ast* children = ast.data.children;

            for (int i = 0; children[i].tag != END; i++) {
                char* segment = create_example(children[i]);

                if (segment == NULL) {
                    free(res);
                    return NULL;
                }
                
                int l = strlen(segment);
                cap = ensure_nuf_space(&res, len+l+1, cap, sizeof(char));
                strcpy(&res[len], segment);
                len+=l;
            }

            res[len] = 0;
            return res;
        }
        case END: {}
    }
    return NULL;
}

int main(int argc, char *argv[]) {
    int cap=8, len=0;
    char* input=expect_nonnull(malloc(sizeof(char)*cap));

    while (1) {
        printf(">> ");
        fflush(stdout);

        char c;
        while ((c=getchar()) != '\n') {
            if (c==EOF) {
                free(input);
                return EXIT_SUCCESS;
            }
            cap = ensure_nuf_space(&input, len+2, cap, sizeof(char));
            input[len++]=c;
        }

        input[len]=0;

        Ast ast;

        parse(input, &ast);

        char* ex = create_example(ast);

        if (ex != NULL) {
            printf("%s\n", ex);
            free(ex);
        } else printf(":(\n");

        cleanup(ast);
        fflush(stdout);
    }
}

entry #7

written by soup girl
submitted at
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cg.hs ASCII text
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{-# LANGUAGE ViewPatterns #-}

module CG where

import Control.Applicative
import Control.Monad
import Control.Monad.Trans.State.Lazy
import Data.List
import Data.Maybe

data R = E | F | C Char | R :|: R | R :&: R | K R deriving (Eq, Ord)

-- i know lyric ly will guess me but she always does
instance Show R where
  show E = ""
  show F = "\a"
  show (C c) = [c]
  show ((show -> "\a") :|: b) = show b
  show ((show -> a) :|: _) = a
  show ((show -> "\a") :&: _) = "\a"
  show (_ :&: (show -> "\a")) = "\a"
  show ((show -> a) :&: (show -> b)) = a ++ b
  show (K _) = ""

type Parser = StateT String Maybe

a = StateT uncons
b = StateT $ maybe (Just ((),[])) (const Nothing) . uncons
c = flip mfilter (StateT uncons) . (==)
d = traverse c
e = asum . map c
f = mfilter (/= E)
g = fromJust . evalStateT (h <* b)
h = foldl (:|:) <$> i <*> many (c '|' *> i)
i = foldl (:&:) <$> j <*> many (f j)
j = (K <$> (f k <* c '*')) <|> k
k = (c '(' *> h <* c ')') <|> l
l = m <|> n <|> o <|> p
m = F <$ d "[]"
n = C <$> e ([' '..'~'] \\ "()[]|*\\")
o = C <$> (c '\\' *> a)
p = E <$ d ""

main = interact $ unlines . map (show . g) . lines

entry #8

written by cdr sa
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cg56.py ASCII text, with very long lines (1238), with CR, LF line terminators
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(lambda entry:(lambda sude,nkin:(lambda sex,regex:(lambda ruined,gaydar:(lambda bent:(lambda cc:(lambda hind,fore:nkin("unmatched ']'")if-1 in(hind)else(lambda clitoris:(lambda backroom,orifice,kleene:(lambda V,P,sh:(lambda bra:nkin("unmatched ')'")if-1==bra else(lambda kleened:nkin("nothing to repeat")if-1==kleened else(lambda SeanArcher:nkin("nothing to repeat")if-1 in(SeanArcher)else"expression cannot match anything"if not(SeanArcher)else sorted(SeanArcher[::-1],key=len)[0])([e for(e)in[V(P,V,s)for(s)in orifice(kleened)]if e!=None]))(kleene(bra)))(backroom(sh)))(lambda P,V,lost:(lambda professed:-1 if any(map(lambda E:type(E)==nkin,professed))else(None)if(None)in(professed)else''.join(professed))([P(V,P,e)if list==type(e)else(e)for(e)in lost]),lambda V,P,sh:(lambda bra:nkin("unmatched ')'")if-1==bra else(lambda kleened:nkin("nothing to repeat")if-1==kleened else(lambda CastorTroy:nkin("nothing to repeat")if-1 in(CastorTroy)else(None)if not(CastorTroy)else sorted(CastorTroy[::-1],key=len)[0])([e for(e)in[V(P,V,s)for(s)in orifice(kleened)]if e!=None]))(kleene(bra)))(backroom(sh)),[c for(s,e)in list(clitoris)for(c)in ruined[e+1:s]+[None]][:-1]))(lambda sh:(lambda parent:(lambda penis,heart:-1 if-1 in(penis)else(lambda
olus2000, WINS_code_guessing
:[c for i,(s,e)in sude(WINS_code_guessing)for(c)in sh[olus2000[i][1]+1:olus2000[i][0]]+[sh[s+1:e]]]+sh[olus2000[-1][1]+1:olus2000[-1][0]])((list(zip(heart+[len(sh)],[-1]+penis))),(zip(heart,penis))))(parent[0],parent[1]))(bent(sh,'(',')')),lambda sh:(lambda organ:[sh[e+1:s]for(s,e)in zip(organ+[len(sh)],[-1]+organ)])(gaydar(sh,1)),lambda sh:(lambda gspot:-1 if-1 in(gspot)else[c for i,c in sude(sh)if not i in gspot and not i+1 in gspot])([-1 if sh[e-1]in[1,7]or not(e)else(e)for(e)in(gaydar(sh,7))])))(zip(fore+[len(ruined)],[-1]+hind)))(cc[0],cc[1]))(bent(ruined,'[',']')))(lambda sh,n,f:(lambda fore,hind:([c for(c)in[(lambda no:-1 if(no<i)else(None)if(no>i)else D)(len([x for(x)in(fore)if x<D])-1)for(i,D)in sude(hind)]if c!=None],[D for(i,D)in sude(fore)if len([x for(x)in(hind)if x<D])==i]))(gaydar(sh,regex([n])[0]),gaydar(sh,regex([f])[0]))))([c for(i,s)in sude([entry[sex[i-1]+2:D]for(i,D)in sude(sex)])for(c)in regex(s)+[entry[sex[i]+1]]][:-1],lambda s,t:[i for(i,c)in sude(s)if c==t]))([i for(i,c)in sude(entry)if c=='\\'and(lambda s:len(s.split([c for(c)in s[::-1].split(s[-1])if c][0][0])[-1])%2)(entry[:i+1])]+[-2],lambda s:[{'(':0,')':5,'[':3,']':2,'|':1,'*':7}.get(c,c)for(c)in s]))(enumerate,SyntaxError))(input()+'69')

entry #9

written by Dolphy
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olus2000.c ASCII text
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#include "olus2000.h"

HELLO I AM OLUS2000 AND I WROTE THIS ENTRY. SO MAKE YOUR GUESSES WITH THAT IN MIND.
YOU DON/*'*/T BELIEVE ME? BUT WHY? HAVE I LIED TO YOU BEFORE? PLEASE,
JUST DRAG MY NICK TO THE APPROPRIATE PLACE. YOU WOULDN/*'*/T WANT TO SEE ME SAD WOULD YOU?
YOU STILL DONT BELIEVE ME? FINE... MY FULL NAME IS ALEKSANDER SABAK. I STUDIED
COMPUTER SCIENCE IN WARSAW UNIVERSITY OF TECHNOLOGY. I LOVE PICO8, ESOLANGS, AND
CONCATANATIVE PROGRAMMING. UMM... OH YEAH AND ALSO TOKI PONA. UHH...
IM FROM POLAND. YOU PROBABLY KNOW IT ALREADY, I JUST WANTED TO POINT IT OUT...
YOU NOW BELIEVE ME, RIGHT? :PLEADING_FACE: I SWEAR, THIS CODE REALLY DOES BELONG TO ME,
I AM NOT IMPERSONATING HIM. AND BY HIM, I MEAN ME OF COURSE. IVE GIVEN A LOT OF PERSONAL
DETAILS SO YOU ARE CONVINCED, R-RIGHT? HAVE A NICE CODE GUESSING
olus2000.h ASCII text
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#define I
#define ESOLANGS UV Hs){YM l=UP(Hs);YM qq
#define STILL 0:0;TC(!(e->s-124)){TC(T)ep(ME[0],to);QH;}
#define IM ){}THAT pt(P*p){TC(pe(p))QH 0;TC(!ph(p,
#define TJ while
#define IT
#define SM break
#define GN(i,s,m)UQ(i,s,m,1)
#define PLACE ME=a;e->sa*=2;}ME[T]=s;++T;}EA th(){B b;b
#define WANT )QH;ek(ME[j]);GN(i,j,T-1){
#define OO free
#define HAVE 0:0;
#define PICO8 QH 0;QH(!(c-pu(p)));}YM ph(P*p
#define AM 
#define MY
#define DETAILS EA gt(){b.
#define ES exit
#include <string.h>
#define YOU 
#define HELLO WD GF
#define WD typedef
#define SAD [i]=ME[i+1];}ME[T-1]=0;T--;}
#define ZC memset
#define RIGHT (THAT)ME);THAT a=0;TJ((a=pt(p))){TJ(!(pm(p,"*")-1))a->s=42;0
#define NICK {THAT*a=OL(JK(THAT)*e->sa*2);GN(i,0,T){
#define UQ(i,s,m,a)for(IZ i=s;i<m;i+=a)
#define NOW ){}THAT pk(P*p){THAT e=ei(95,2);YM qq
#define YEAH QH p->st[p->c-1];}QP pa
#define IMPERSONATING TT(!(c->st-2)){YM r=0;GN(j,0,c->ns){THAT cc=c->se[j];B b;b
#define WANTED "Unclosed\'(\'!");QH e;}LV:{TC((cc-41)&&(cc-124))
#define UHH x=0;pa(p);}QH c;}EA qo(YM n,
#define A
#define PONA YM c=ph(p,Hs);TC(c){B b;b
#define BELONG ef(THAT e){TC(e->s-124)QH e;ca((THAT)
#define CONVINCED EA yaf(IZ x
#define COMPUTER ){PI(UD,"%s",m);pf(p);
#define KNOW TC(pa(p)-93)pn(p,"Character classes must be empty!");
#define UP strlen
#define NICE }} EA bo(){P*p;THAT x;x=(
#define WITH }P;
#define PLEADING_FACE es(e,a);}0?
#define JK sizeof
#define WHY ek(THAT e){ME
#define UNIVERSITY pu(P*p){TC(pe(p))QH 0;QH
#define AND
#define BELIEVE = 0;ca((THAT)
#define CONCATANATIVE pp;GN(i,0,l){TC(pc(p,Hs[i]))QH 1;}
#define TC if
#define DON x=0;E*e=OL(JK(E));e->s=c;e->sa=1;
#define FROM "\\*|()[]")){QP c=pa(p);TC(!c)QH 0;QH
#define YM int
#define THAT E*
#define MIND ei(QP c,YM st){b
#define THE
#define QH return
#include <stdlib.h>
#define OLUS2000 E{QP s;
#define PROBABLY x){BL 92:{QH ei(pa(p),0);}BL 91:{
#define IS
#define WOULD EA ep(THAT e,QP*to){IZ t=0;t
#define UV QP const*
#define ENTRY }E;WD GF{YM x;}B;B b;EA ca(THAT x, THAT y){b
#define BYE }}
#define BY x=0;TC(!(cc->st-1)){sr(e,i);r=1;SM;}TC(!(cc->s-42)){ek(cc);YM foo
#define IZ size_t
#define GIVEN QP*o=OL(JK(QP)*BM);ZC(o,0,BM);ep(p->x,o);pf(p);QH o;}
#define IN 
#define DRAG THAT y){}EA es(THAT e,THAT s){TC(!(T+1-e->sa))
#define THIS
#define BUT (THAT)ME:(THAT)ME,(THAT)ME);ME=OL(JK(THAT));e->se[0]=0;e->st=st;QH e;}EA 
#define MAKE UV st;IZ l;
#define BM 1024
#define ME e->se
#define ARE } GN;
#define CODE 0);THAT l=pk(p);es(x,l);TJ(pm(p,"|"))
#define TL strncat
#define T e->ns 
#define ALSO (P*p){QP c=pu(p);++p->c;
#define OF
#define BEFORE ek(ME[i]);}OO(ME);IZ wm;wm
#define PROGRAMMING QH 0;}EA uw(){B b;b
#define WROTE GF THAT*se;IZ ns;IZ sa;YM st;
#define DOES THAT pr(P*p){p->x=pp(p);QH p->x;}THAT
#define TO 
#define APPROPRIATE a[i]=ME[i];}OO(ME);
#define FULL ){}P*pi(UV s){P*p=OL(JK(P));
#define LIED GN(i,0,T){
#define UMM x=0;}EA am(YM n,
#define OH ){}QP pv(P*p){TC(!(p->c-0)||(p->c>p->l))QH 0;
#define LV default
#define FINE (THAT)0:(THAT)0, 0);}THAT pp(P*p);EA ox(IZ n,
#define PLEASE 0:0;}EA db(THAT x
#define POLAND ei(c,0);}QP cc=pa(p);B b;b.x=0;XH(cc+b
#define ROUND
#define GUESSING {}}
#define ALREADY QH ei(71,1);}BL 40:{THAT e=pp(p);TC(pa(p)-41)pn(p
#define R YM y){THAT e;P*p; x=((THAT)x
#include <stdio.h>
#define XH switch
#define MEAN bar;c->se[j]=ei(95,2);}}TC(r)GW;}TC(!(c->s-42)){ek(
#define SCIENCE ES(1);}YM pe(P* p){
#define HIM
#define NAME p->st=s;p->c=0;p->l=UP(s);p->x=0;QH p;}
#define UD stderr
#define LOVE x=0;}YM pc(P*p,QP c){TC(pe(p))
#define SEE
#define SWEAR 0;QH e;}THAT pp(P*p){THAT x=ei(124
#define GUESSES THAT x;
#define EA void
#define GW continue
#define PERSONAL
#define POINT pn(p,"Unexpected Character");p->c-=1;QH 0;}}QH 0;}
#define OUT EA jr(int s,
#define LOT
#define QP char
#define STUDIED x=0;}EA pn(P*p,UV m
#define TT else TC
#define IVE x=0;} QP*entry(UV r){P*p=pi(r);pr(p);ef(p->x);
#define BL case
#define NOT (THAT)ME);UQ(i,0,T,0){THAT c=ME[i];TC(!(c->s-124))ef(c->se[i]);
#define DONT TC(!(e->st-2)){GN(i,0,T){ep(ME[i],to);}QH;}TL(to,&e->s,1);IZ x
#define PI fprintf
#define YOUR IZ c;
#define WOULDN x=0;}EA sr(THAT e,IZ j){TC(j>= 
#define SABAK TC(p->x)ek(p->x);OO(p);B b;b
#define SO x=0;}WD GF{
#define REALLY {THAT r=pk(p);es(x,r);}QH x;}
#define JUST
#define GF struct
#define TECHNOLOGY p->st[p->c];}EA zl(){B b;b
#define TOKI QH c;}YM pm(P*p,UV Hs){
#define ALEKSANDER EA pf(P*p){
#define COURSE [i]);ME[i]=ei(95,2);}++i;}QH e;}EA nh(){B b;b
#define OL malloc
#define WARSAW QH(p->c>=p->l);}QP

entry #10

written by taswelll
submitted at
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entry.fs ASCII text, with CRLF line terminators
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\ Code by Jia Tan (<https://github.com/JiaT75>)

: pop ( src u -- src' u' c ) 1- swap dup c@ swap char+ -rot ;
: shift ( src u -- src' u' ) 1- swap char+ swap ;

: peek ( src u -- src u c ) over c@ ;
: ?peek ( src u -- src u c ) dup if peek else -1 then ;

: skip-'\' ( src u c -- src u c )
	dup '\' = if drop pop then
;

defer parenthesis
: terminal ( src u -- src u unrch? )
	pop 
	dup '(' = if drop parenthesis else
	dup '[' = if drop shift -1 else
		skip-'\' c, 0 then then
;
: kleene ( src u unrch? -- src u unrch? )
	third c@ '*' = if drop shift 0 then
;

: not-ending? ( src u -- src u continue? )
	dup if peek dup '|' <> swap ')' <> and else 0 then
;
: alternative ( src u -- src u unrch? )
	0 >r begin not-ending? while
		terminal kleene r> or >r
	repeat r>
;

: find-candidate ( src u -- start src u unrch? )
	here -rot  ( keep in stack, in case we need to restore )
	begin
		alternative while ( break if reachable )
		third ->here ( restore string )
		?peek '|' = if shift else -1 exit then
	repeat 0
;
: paren-depth ( c n -- n' )
	over '(' = if 1+ else over ')' = if 1- then then nip
;
: skip-until-')' ( src u -- src' u' )
	1 >r begin 
		dup 0= if exit then ( quit if empty )
		pop skip-'\' r> paren-depth dup >r while
	repeat rdrop
;

:noname ( src u -- src u unrch? )
	find-candidate >r rot drop skip-until-')' r>
; is parenthesis

: recover ( start -- str u ) here over - [ 1 chars ] literal / ;
: generate ( src u -- str u unrch? )
	find-candidate >r 2drop recover r>
;
: deallot ( src u -- ) chars negate allot drop ;
: main ( -- )
	generate if ." *unreachable*" else 2dup type cr then deallot
;

next-arg main bye

entry #11

written by kimapr
submitted at
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amogus ELF 64-bit LSB shared object, x86-64, version 1 (SYSV)
amogus.h ASCII text
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typedef void(entry_callback)(char *match, int size, void *data);
int entry(const char *regex, entry_callback *callback, void *data);
amogus.png PNG image data, 720 x 720, 8-bit colormap, non-interlaced

entry #12

written by olus2000
submitted at
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comments 3
olus2000 *known at the time as [author of #12]

There exist certain input methods that establish different inputs. You can simulate them for varying input tests or introduce real input into the interpreter.


cdr sa

thank you olus2000 (UID: 339009650592710656)


olus

language by olus2000 code by olus2000


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entry.prick ASCII text, with very long lines (46062)
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Code by olus2000 (UID: 339009650592710656)
Takes: length of input in cell 0 and input in following cells
Returns: length of output in cell 0 and output in following cells
Runs on the reference implementation.
: comment


over >aux
rot drop swap dup rot
: parse-(


rot drop aux> rot rot
: parse-)


rot drop swap dup rot ++ $ 1 [ dup ++ @ 42 != |
    swap drop swap drop aux@ aux@ rot
    1 >aux 0 @ [ aux@ |
        1 [ dup @ 40 != over @ 92 != * over @ 41 != * over @ 124 != * | ++ ]
        1 [ dup @ 40  != 1 != | 0 0 @ [ 1 [ over @ 41 != 1 != | -- ] 1 [ over @ 40 != 1 != | ++ ] dup | 1 [ over @ 92 != 1 != | swap ++ swap ] swap ++ swap ] drop ++ ]
        1 [ dup @ 92  != 1 != | ++ ++ ]
        1 [ dup @ 41  != 1 != | aux> aux> drop >aux ++ 1 [ dup 42 != 1 != | -- aux> -- >aux ] 1 [ aux@ | swap drop swap drop aux> aux@ swap >aux dup rot ] ]
        1 [ dup @ 124 != 1 != | aux> -- >aux ]
    ] aux> drop
]
: parse-[


rot drop
>aux dup ++ aux> ++
over over @ swap !
: parse-\


1 0 @ [ 1 [ over @ 41 != 1 != | -- ] 1 [ over @ 40 != 1 != | ++ ] dup | 1 [ over @ 92 != 1 != | swap ++ swap ] swap ++ swap ] drop --
: parse-|


swap drop swap dup rot
: parse-*


rot drop
>aux dup ++ aux>
over over @ swap !
: parse-c


1
dup [ over @ 40  != 1 != | drop parse-( 0 ]
dup [ over @ 41  != 1 != | drop parse-) 0 ]
dup [ over @ 91  != 1 != | drop parse-[ 0 ]
dup [ over @ 92  != 1 != | drop parse-\ 0 ]
dup [ over @ 124 != 1 != | drop parse-| 0 ]
dup [ over @ 42  != 1 != | drop parse-* 0 ]
    [               1    |      parse-c   ]
++
: parse-char


102 124 111 111 42
5 dup 0 ! dup >aux [ 1 | aux@ ! aux> -- >aux ] aux> drop
: _input


92 91 92 93 40 91 93 102 100 115 124 113 91 93 42 119 101 41 40 114 116 91 93 121 104 124 108 115 91 93 59 92 41 41 42
35 dup 0 ! dup >aux [ 1 | aux@ ! aux> -- >aux ] aux> drop
: input


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14295 dup 0 ! dup >aux [ 1 | aux@ ! aux> -- >aux ] aux> drop
: _input


input
0 >aux 0 0 1
0 @ [ 0 @ ++ over - | parse-char ]
drop 0 ! drop aux> drop

entry #13

written by moshikoi
submitted at
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rejects.c ASCII text
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static bool entry_impl(const char **const ptr, char **const out) {
  char *const savepoint = out ? *out : nullptr;
  bool success = true;
  while (**ptr && **ptr != ')') {
    switch (**ptr) {
    case '\\': (*ptr)++;
    default:
      const char c = **ptr;
      if (*++*ptr == '*')
        (*ptr)++;
      else if (out)
        *(*out)++ = c;
      break;
    case '[':
      (*ptr) += 2;
      if (**ptr == '*')
        (*ptr)++;
      else
        success = false;
      break;
    case '(': {
      (*ptr)++;
      char *const savepoint = out ? *out : nullptr;
      bool inner_success = entry_impl(ptr, out);
      (*ptr)++;
      if (!inner_success) {
        if (**ptr == '*') {
          (*ptr)++;
          if (out) *out = savepoint;
        } else
          success = false;
      }
      break;
    }
    case '|':
      (*ptr)++;
      if (success || !out) {
        entry_impl(ptr, nullptr);
        break;
      } else {
        *out = savepoint;
        return entry_impl(ptr, out);
      }
    }
  }
  return success;
}

bool entry(const char *regex, char *out) {
  if (entry_impl(&regex, &out)) {
    *out = 0;
    return true;
  }
  return false;
}

int run(char *regex, size_t len) {
  char *res = malloc(len);
  if (entry(regex, res)) {
    puts(res);
    free(res);
    return 0;
  } else {
    fputs("No valid string", stderr);
    free(res);
    return 1;
  }
}

int main(int argc, char **argv) {
  int ret;
  switch (argc) {
  case 1:
    const int INPUT_LIMIT = 1'000;
    char * const input = malloc(INPUT_LIMIT);
    if (!fgets(input, INPUT_LIMIT, stdin)) {
      puts("Couldn't read input");
      return 1;
    }
    ret = run(input, strlen(input) + 1);
    free(input);
    return ret;
  case 2:
    size_t buffer_capacity = 2048;
    size_t buffer_size = 0;
    char *buffer = malloc(buffer_capacity);

    FILE *file;
    if (!(file = fopen(argv[1], "r"))) {
      fprintf(stderr, "Failed to read from %s", argv[1]);
      return 1;
    }
    size_t read_count;
    while (1) {
      if (buffer_size == buffer_capacity - 1) buffer = realloc(buffer, buffer_capacity *= 2);
      read_count = fread(buffer + buffer_size, 1, buffer_capacity - 1 - buffer_size, file);
      if (!read_count) break;
      buffer_size += read_count;
    }
    buffer[buffer_size] = 0;
    ret = run(buffer, buffer_size + 1);
    free(buffer);
    return ret;
  case 3: return run(argv[2], strlen(argv[2]) + 1);
  }
}