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/**
* Return true if the field value matches the given format RegExp
*
* @example $.validator.methods.pattern("AR1004",element,/^AR\d{4}$/)
* @result true
*
* @example $.validator.methods.pattern("BR1004",element,/^AR\d{4}$/)
* @result false
*
* @name $.validator.methods.pattern
* @type Boolean
* @cat Plugins/Validate/Methods
*/
$.validator.addMethod("pattern", function(value, element, param) {
	if (this.optional(element)) {
		return true;
	}
	if (typeof param === "string") {
		param = new RegExp("^(?:" + param + ")$");
	}
	return param.test(value);
}, "Invalid format.");