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copied!<h2>C (interpreting), <strike>630</strike> <strike>622</strike> <strike>617</strike> <strike>615</strike> <strike>582</strike> <strike>576</strike> <strike>573</strike> <strike>572</strike> <strike>558</strike> <strike>554</strike> <strike>544</strike> <strike>538</strike> <strike>529</strike> <strike>504</strike> <strike>502</strike> <strike>500</strike> 499 chars</h2> <p>This understands parentheses, and works on the regexp live (i.e. not parsed first)</p> <pre><code>#define C char #define M m(s,o m(C*s,C*o,C*S,C*p,C*P,C T){C*n=P-1,*q=s,h=*P==41,c=1;for(;h*c;c-=*n--==40)c+=*n==41; c=*P-42;c=p-P?c-82?T&&c&~1&&c-21?h?2:*S==*P&s<S?M,S-1,p,n,2)||(T&4&&M,S-1,p,P,T|1)): 4:M,T?S:o,p,P-1,T?c&~1?3:7-c:0):T&&s==S||M,o,p,P-1,2):T&&s==S;if(c==2)for(c=4;q<=S;q ++)c|=m(q,S,S,n+h,P-h,2)?M,q,p,n,2)||q<S&T/4&&M,q,p,P,T&6):0;return c&4?c&1?:T&1&&M,S,p,n,2)||M,o,p,n,0):c;}main(C*w,C**v){C*u;for(w=*++v;*++v;)puts(m(*v -1,u,u=index(*v,0)-1,w-1,index(w,0)-1,2)?"true":"false");} </code></pre> <p>compiling with -Wall complains about argc being char. Will crash on illegal patterns.</p> <p>This parses regexp and string from right to left, saving a few chars.</p> <p>input on argv, output in <strike>reverse</strike> normal order:</p> <pre><code>$ ./a.out ab*a aa abba abab b true true false false $ ./a.out "0*1|10" 1 10 0110 00001 true true false true $ ./a.out "0*(1|1+0)" 1 10 0110 00001 true true true true $ ./a.out "a?b+|(a+b|b+a?)+" abb babab aaa aabba a b true true false true false true $ ./a.out "((A|B|C)+(a|(bbbbb)|bb|c)+)+" ABCABCaccabbbbbaACBbbb false $ ./a.out "((A|B|C)+(a|(bbbbb)|bb|c)+)+" ABCABCaccabbbbbaACBbbbb true </code></pre>

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