perl -le '$string="abcX123"; $string =~ /X([^\s]+)/; print $1;'

123

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Update 2003-12-04 12:50:48 CET: See saouq's node in this thread for a solution which fills all of Anonymous Monk's requirements, as mentioned in opqdonut's post below.

--
Allolex

In reply to Re: Capturing everything after an optional character in a regex? by allolex
in thread Capturing everything after an optional character in a regex? by Anonymous Monk

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