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\w will match anything that is alphanumeric
\W will match anything that is NOT alphanumeric.
First, \w and \W include the underscore as part of the class, and I
think he wants it treated as a separator. Second, as Scott mentioned
before, there is no single standard for what is allowed in a regex
expression. You have to make sure you are using terms recognized by
the version you are using. Things like \W or \d are Perl extensions,
and while some utilities support them to a various degree, not
everything does so I tend to just avoid them and use explicit
equivalents that work everywhere.
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