Hi,
In Inline.pm's sub read_DATA there's a regex seeking to match /_\S+?__\n/
I haven't yet seen how the ? can have an effect on the result.

That is, for what strings will /__\S+?__\n/ and /__\S+__\n/ return a different result ?

I ran this script (perl-5.16.0) to check for some difference - but it doesn't detect any: 
use warnings;

@str = ("____\n", "__ __\n", "__X __\n", "__Z__\n", "__\n__\n", "__^__
+\n");

for(@str) {
   if($_ =~ /__\S+?__\n/) {print "1 "}
   else {print "0 "}

   if($_ =~ /__\S+__\n/) {print "1\n"}
   else {print "0\n"}
}

__END__
Outputs:
0 0
0 0
0 0
1 1
0 0
1 1

[download]
Cheers,
Rob

In reply to Puzzled by regex by syphilis

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