_prettyRegExp(regexString, stripSlash = true) {
		const str = stripSlash
			? regexString.source + regexString.flags
			: `${regexString}`;
		return str.replace(/!/g, "%21").replace(/\|/g, "%7C");
	}
@private
@param {RegExp} regexString RegExp as a string
@param {boolean=} stripSlash do we need to strip a slsh
@returns {string} pretty RegExp