ABPCMS.Web/lib/jquery-validation/src/additional/extension.js

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// Older "accept" file extension method. Old docs: http://docs.jquery.com/Plugins/Validation/Methods/accept
$.validator.addMethod( "extension", function( value, element, param ) {
	param = typeof param === "string" ? param.replace( /,/g, "|" ) : "png|jpe?g|gif";
	return this.optional( element ) || value.match( new RegExp( "\\.(" + param + ")$", "i" ) );
}, $.validator.format( "Please enter a value with a valid extension." ) );