in reply to Specific substitution in regular expressions

What I do in cases like this is to use look-around assertions: 
s/(?<=12345)99(?=1234)/$variable/g;

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Of course no /g is needed when only one instance should be replaced.

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Re^2: Specific substitution in regular expressions
by cstrong (Beadle) on Sep 17, 2008 at 10:20 UTC
    Thanks guys. The look ahead / behined assertion method and breaking down the regex in to more matches look like what I need.
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