@wordpress/url/build-module/get-protocol.js

WordPress URL utilities.

/**
 * Returns the protocol part of the URL.
 *
 * @param {string} url The full URL.
 *
 * @example
 * ```js
 * const protocol1 = getProtocol( 'tel:012345678' ); // 'tel:'
 * const protocol2 = getProtocol( 'https://wordpress.org' ); // 'https:'
 * ```
 *
 * @return {string|void} The protocol part of the URL.
 */
export function getProtocol(url) {
  var matches = /^([^\s:]+:)/.exec(url);

  if (matches) {
    return matches[1];
  }
}
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