On Oct 24, 2012, at 23:54, Brian Gernhardt <br...@gernhardtsoftware.com> wrote:

> It works if I change \s to [[:space:]], but I don't know how portable that is.

As \s is shorthand for the POSIX character class [:space:], I'd say the latter
should be more portable: anything accepting the shorthand should also accept
the full character class. If not, you probably only care about horizontal tab
and space, for which you could just use a simple regular expression. Just a
literal space and tab character between square brackets is probably going to be
most portable, though not most readable.

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