Don't use raw sql statements like this: 
$SQL = "UPDATE $regtable SET favorites='$favorites' WHERE ID='$ID'";

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Use placeholders instead. 
my $sth = $dbh->prepare(qq{UPDATE $regtable SET favorites=? WHERE ID=?
+});
$sth->execute($favorites, $ID) or die $dbh->errstr;

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That way the escaping is done for you, and you avoid sql injection attacks.

Also, I advise you to use strict and use warnings. It appears that you're relying on global variables instead of passing parameters to your subs. This is very bad practice.

In reply to Re: Escaping then un-escaping an apostrophe by wind
in thread Escaping then un-escaping an apostrophe by htmanning

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