This file is indexed.

/usr/lib/nodejs/es5-ext/reg-exp/is-reg-exp.js is in node-es5-ext 0.10.30-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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"use strict";

var objToString = Object.prototype.toString, id = objToString.call(/a/);

module.exports = function (value) {
	return (value && (value instanceof RegExp || objToString.call(value) === id)) || false;
};