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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:
#!/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);
That spits out

Best regards

Antonio Bellezza

In reply to Re: Regex refresher by abell
in thread Regex refresher by FoxtrotUniform

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