PERL Programming - RegEx: Using backreference in match

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RegEx: Using backreference in match

Thorsten Walenzyk

2004-10-26, 3:56 pm

Hi all,

I have a question regarding Regular Expression and backreference.

Is it possible to use backreferences within the same reg ex?
e.g.
m/SomeText([0-9]+).*?SomeOtherText($1)/gs

$1 should be the number of the match behind "SomeText"

BR Thorsten

John W. Krahn

2004-10-26, 8:55 pm

Thorsten Walenzyk wrote:
>
> I have a question regarding Regular Expression and backreference.
>
> Is it possible to use backreferences within the same reg ex?
> e.g.
> m/SomeText([0-9]+).*?SomeOtherText($1)/gs
>
> $1 should be the number of the match behind "SomeText"

Yes it is possible, like this:

/SomeText(\d+).*?SomeOtherText\1/gs

John
--
use Perl;
program
fulfillment

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