Thanks, ikegami!

How will the regex change if I need to match more than one digit before %var%? Just can't think of anything at the moment...

Edited: Sorry, just discovered that moving the ? solves the problem. 

#$str =~ s/(\d+?)%var%(.*)/$1REPLACED$2/;</strikeout>
As pointed out by Eimi Metamorphoumai 
$str =~ s/(\d*)%var%(.*)/$1REPLACED$2/;</strikeout>

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In reply to Re^2: Regex triggering uninitialised values by kiat
in thread Regex triggering uninitialised values by kiat

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