@wordpress/url/build-module/is-valid-protocol.js

WordPress URL utilities.

/**
 * Tests if a url protocol is valid.
 *
 * @param {string} protocol The url protocol.
 *
 * @example
 * ```js
 * const isValid = isValidProtocol( 'https:' ); // true
 * const isNotValid = isValidProtocol( 'https :' ); // false
 * ```
 *
 * @return {boolean} True if the argument is a valid protocol (e.g. http:, tel:).
 */
export function isValidProtocol(protocol) {
  if (!protocol) {
    return false;
  }

  return /^[a-z\-.\+]+[0-9]*:$/i.test(protocol);
}
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