util-ex/lib/is/string/regexp.js

Browser-friendly enhanced util fully compatible with standard node.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
exports.isRegExpStr = isRegExpStr;
/**
 * Determines if a string represents a valid JavaScript RegExp.
 * @param {string} aRegExpString - The string to test.
 * @returns {boolean} - True if the string represents a valid EegExp, false otherwise.
 * @example
* isRegExpStr('/[a-z]/g') // true
* isRegExpStr('/not a regexp') // false
*/
function isRegExpStr(value) {
  let result = typeof value === 'string' && value.length > 2 && value[0] === '/';
  if (result) {
    const i = value.lastIndexOf('/');
    if (i <= 0) {
      result = false;
    } else {
      const source = value.slice(1, i);
      const flags = value.slice(i + 1);
      try {
        new RegExp(source, flags);
      } catch (e) {
        result = false;
      }
    }
  }
  return result;
}
var _default = exports.default = isRegExpStr;