Weird. I can reproduce OPs issue:
$ cat /tmp/x
my $regex = '(2[0-4]|1?[0-9])?[0-9]|25[0-5]';
while (<>) {
chomp;
if ($_ =~ /^$regex$/) {
print "$_ matched\n";
} else {
print "$_ did not match\n";
}
}
$ perl /tmp/x
100
100 matched
200
200 matched
300
300 matched
^C
In fact adding any "|<something>" seems to trigger it, i.e.
my $regex = '(2[0-4]|1?[0-9])?[0-9]|a';
gives the exact same result, and additionally matches anything starting with "a".
Aha. Looks like switching from
my $regex = '(2[0-4]|1?[0-9])?[0-9]|25[0-5]';
to
my $regex = qr/(2[0-4]|1?[0-9])?[0-9]|25[0-5]/;
seems to fix it. I don't immediately see why though.
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