This file is indexed.

/usr/lib/nodejs/es5-ext/reg-exp/valid-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 isRegExp = require("./is-reg-exp");

module.exports = function (value) {
	if (!isRegExp(value)) throw new TypeError(value + " is not a RegExp object");
	return value;
};