in reply to Regex triggering uninitialised values

The following works for me:

$str =~ s/(\d?)%var%(.*)/$1REPLACED$2/;

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Re^2: Regex triggering uninitialised values
by kiat (Vicar) on Nov 19, 2004 at 17:46 UTC
    Thanks, jimbojones!

    What if I need to match more than one digit before %var%?

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      Then you'd have 
      $str =~ s/(\d*)%var%(.*)/$1REPLACED$2/;

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      Although, unless you're going to use $1 and/or $2 later, there's no reason to have them at all. 
      $str =~ s/%var%/REPLACED/;

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[d/l]
[select]
      (\d*)
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