Further to kcott's post:

$ perle 'my %ent = qw{& &amp; < &lt; > &gt;}; say "... < & > ..." =~ s/([&><])/$ent{$1}/gr'
... &lt; &amp; &gt; ...

luc.bouge:   Also see haukex's article for a very useful technique to dynamically prepare a search (sub-)regex from a "translation" hash like %ent.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Brace in the replacement part of a regular expression substitution by AnomalousMonk
in thread Brace in the replacement part of a regular expression substitution by luc.bouge

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