Because your regex just looks for <cfmail, which still occurs in the commented-out version. My guess is that it is repeated because you've run it multiple times. Try this (untested):

$outdata =~ s{(?<!<!--- )<cfmail}{<!--- <cfmail}g
$outdata =~ s{</cfmail>(?! --->)}{</cfmail> --->}g;

[download]

That will only replace cfmail tags that aren't preceeded by a comment delimiter, and closing cfmail tags that aren't followed by a comment delimiter.

-b

In reply to Re: Unexpected results from a regex replacement by bgreenlee
in thread Unexpected results from a regex replacement by yacoubean

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