in reply to Regex refresher
I believe you should put a ^ and $ to start and end the regex, which otherwise matches everything.
Since the search space is pretty small, one can answer the shortest ten question with a brute force search, observing that only binary strings match:
Best regards
Antonio Bellezza
Since the search space is pretty small, one can answer the shortest ten question with a brute force search, observing that only binary strings match:
That spits out#!/usr/bin/perl -w use strict; my @strings = (''); for my $a (1..10) { for my $b (0..(2**$a-1)) { push @strings, sprintf ("%0".$a."b", $b); } } print "->", join("<-\n->", grep /^(0|1(01*0)*1)*$/, @strings);
-><- ->0<- ->00<- ->11<- ->000<- ->011<- ->110<- ->0000<- ->0011<- ->0110<- ->1001<- ->1100<- ->1111<- ->00000<- ->00011<- ->00110<- ->01001<- ->01100<- ...
Best regards
Antonio Bellezza
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