in reply to Re^4: How to use \W in Regular Expression?
in thread How to use \W in Regular Expression?
It'll ignore everything it doesn't match. You don't have to do anything.
If $query contains a literal text to match:
$str =~ s/\Q$query\E/<em>$query<\/em>/ig;
If $query contains a regex pattern:
$str =~ s/($query)/<em>$1<\/em>/ig;
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