in reply to Re^2: Match Optional Groups with 1 Required Group
in thread Match Optional Groups with 1 Required Group

? is zero or one. You need *, which is 0 or more.:

print "$_: ", m[^\w+(?:\.\w+)*$] ? "matched\n" : "failed\n"
     for qw[ one one.two one.two.three four.five.six.seven one. one-tw
+o ];;
one:  matched
one.two:  matched
one.two.three:  matched
four.five.six.seven:  matched
one.:  failed
one-two:  failed

[download]
Each title needs at least one character as well.

+ means 1 or more, so that's covered by \w+

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In Section Seekers of Perl Wisdom