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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
* Converts a URL-like string which might include the `*` character as a wildcard
* to a regular expression. They are used to match against actual URLs for the
* request blocking feature from DevTools.
* The returned regular expression is case insensitive.
* @param {string} url
* A URL-like string which can contain one or several `*` as wildcard
* characters.
* @return {RegExp}
* A regular expression which can be used to match URLs compatible with the
* provided url "template".
export function wildcardToRegExp(url) {
return new RegExp(url.split("*").map(regExpEscape).join(".*"), "i");
* Escapes all special RegExp characters in the given string.
const regExpEscape = s => {
return s.replace(/[|\\{}()[\]^$+*?.]/g, "\\$&");