SAMS Teach Yourself Perl in 24 Hours THIRD EDITION

Q&A

Q1:	The pattern /\W(\w)+\W/ doesn't seem to match all the words on the line, just the ones in the middle. Why?
A1:	You're looking for word characters surrounded by nonword characters. The first word of the line—assuming it starts at the beginning of the line—doesn't have a nonword character in front of it. It doesn't have a character in front of it at all.
Q2:	What's the difference between m// and //? I don't get it.
A2:	There's almost no difference at all. The only difference is that if you decide to specify a pattern delimiter other than /, you can do so only if you precede the pattern with an m—for example, m!pattern!.
Q3:	I'm trying to verify that the user typed a number, but /\d*/ doesn't seem to work. It always returns true!
A3:	It returns ...