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);

[download]
That spits out 
-><-
->0<-
->00<-
->11<-
->000<-
->011<-
->110<-
->0000<-
->0011<-
->0110<-
->1001<-
->1100<-
->1111<-
->00000<-
->00011<-
->00110<-
->01001<-
->01100<-
...


Best regards

Antonio Bellezza

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

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