s/// to the rescue ! The s/// POD (should explain)explains how you can use it to substitute chars.

$foo = "I love beer ! I really love it";
$foo =~ s/love/adore/g; #This will swap love with adore, every occuran
+ce
#The g is for global.
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Greetz
Beatnik
... Quidquid perl dictum sit, altum viditur.