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Re: subroutine within regex quantifier?

by chipmunk (Parson)
on Dec 04, 2001 at 09:54 UTC ( [id://129270]=note: print w/replies, xml ) Need Help??


in reply to subroutine within regex quantifier?

Subroutines and method calls don't interpolate inside strings or regexes. However, there's a common trick for interpolating an arbitrary expression inside a double-quoted string, that will work just as well in a regex:
"@{[ reverse 1 .. 3 ]} go!" # reverse 1 .. 10 is in list context "2 + 2 = ${\( 2 + 2 )}"; # 2 + 2 is in scalar context
So, you could write your regex in one of these ways:
/^[a-z]{@{[ WORD_LENGTH ]}}$/i /^[a-z]{${ \WORD_LENGTH }}$/i
Although they might be hard to read... :)

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