ColdFusion UDF to remove optional "dots" and "plus addressing" from Gmail addresses to normalize the username. (Created due to comment spam from randomized gmail usernames.)

SanitizeGmail.cfm

<cfscript>
string function sanitizeGmail(required string email) output=false hint="I strip dot notation and plus extras from a gmail address" {
	if (listLast(trim(arguments.email),"@") is "gmail.com"){
		local.username = ListFirst(trim(arguments.email), "@");
		local.username = replace(listFirst(local.username, "+"), ".", "", "all");
		arguments.email = local.username & "@gmail.com";
	}
	return arguments.email;
}
</cfscript>