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Answer: How do i find $a and replace it with $b when it's preceded by $c?
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Q&A > regular expressions > How do i find $a and replace it with $b when it's preceded by $c? contributed by nuance

A postivive look behind clause in the regular expression will do what you want. 
my($a, $b, $c, $d) = qw{foo bar moo moofooyou);

$d =~ s/(?<=$c)$a/$b/g;

[download]
produces moobaryou in $d

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