Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Re: subroutine within regex quantifier?

by chipmunk (Parson)
on Dec 04, 2001 at 09:54 UTC ( #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... :)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://129270]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (7)
As of 2020-01-28 19:27 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Notices?