core-js/internals/is-regexp.js

Standard library

var isObject = require('../internals/is-object');
var classof = require('../internals/classof-raw');
var wellKnownSymbol = require('../internals/well-known-symbol');

var MATCH = wellKnownSymbol('match');

// `IsRegExp` abstract operation
// https://tc39.es/ecma262/#sec-isregexp
module.exports = function (it) {
  var isRegExp;
  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) == 'RegExp');
};