Subroutines in a regex?

heidkamp has asked for the wisdom of the Perl Monks concerning the following question: ⭐ (regular expressions)

I want to replace text with the results of a subroutine, ie

 
s/SUM(\d*)/sum($1)/g

sub sum()
[download]

using (?{CODE}) is 0 width (no replacement), and I can't get it to work in the replacement section anyway.
Any ideas?

Originally posted as a Categorized Question.

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Re: Subroutines in a regex?⭐ by busunsl (Vicar) on Apr 04, 2001 at 19:06 UTC
use `s/SUM(\d*)/sum($1)/eg` [download] this will execute the subroutine.	[reply] [d/l]
Re: Subroutines in a regex? by alfie (Pilgrim) on Apr 05, 2001 at 13:39 UTC
busunsl is right, but I'd like to add another feature and DWIM[1] to your code: `s/(SUM(\d))/&sum($2)/eg` [download] For I think you want to have the SUM characters stripped off, don't you? [1] Do What I Mean* -- Alfie	[reply] [d/l]
Re: Answer: Subroutines in a regex? by busunsl (Vicar) on Apr 05, 2001 at 14:56 UTC
Sorry to disagree, but you don't have to put parenthesis around the whole pattern, it will be substituted anyway.	[reply]
Re: Subroutines in a regex? by kilinrax (Deacon) on Apr 04, 2001 at 19:06 UTC
This is what the '`e`' option is designed for: `s/SUM(\d)/sum($1)/ge` [download] Originally posted as a Categorized Answer.*	[reply] [d/l]