1 files changed, 40 insertions, 30 deletions

diff --git a/node_modules/is-regex/index.js b/node_modules/is-regex/index.js
index be6513390..b66d13e31 100644
--- a/node_modules/is-regex/index.js
+++ b/node_modules/is-regex/index.js
@@ -1,39 +1,49 @@
 'use strict';
 
-var has = require('has');
-var regexExec = RegExp.prototype.exec;
-var gOPD = Object.getOwnPropertyDescriptor;
-
-var tryRegexExecCall = function tryRegexExec(value) {
-	try {
-		var lastIndex = value.lastIndex;
-		value.lastIndex = 0;
-
-		regexExec.call(value);
-		return true;
-	} catch (e) {
-		return false;
-	} finally {
-		value.lastIndex = lastIndex;
+var hasSymbols = require('has-symbols')();
+var hasToStringTag = hasSymbols && typeof Symbol.toStringTag === 'symbol';
+var regexExec;
+var isRegexMarker;
+var badStringifier;
+
+if (hasToStringTag) {
+	regexExec = Function.call.bind(RegExp.prototype.exec);
+	isRegexMarker = {};
+
+	var throwRegexMarker = function () {
+		throw isRegexMarker;
+	};
+	badStringifier = {
+		toString: throwRegexMarker,
+		valueOf: throwRegexMarker
+	};
+
+	if (typeof Symbol.toPrimitive === 'symbol') {
+		badStringifier[Symbol.toPrimitive] = throwRegexMarker;
 	}
-};
+}
+
 var toStr = Object.prototype.toString;
 var regexClass = '[object RegExp]';
-var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
 
-module.exports = function isRegex(value) {
-	if (!value || typeof value !== 'object') {
-		return false;
-	}
-	if (!hasToStringTag) {
-		return toStr.call(value) === regexClass;
-	}
+module.exports = hasToStringTag
+	// eslint-disable-next-line consistent-return
+	? function isRegex(value) {
+		if (!value || typeof value !== 'object') {
+			return false;
+		}
 
-	var descriptor = gOPD(value, 'lastIndex');
-	var hasLastIndexDataProperty = descriptor && has(descriptor, 'value');
-	if (!hasLastIndexDataProperty) {
-		return false;
+		try {
+			regexExec(value, badStringifier);
+		} catch (e) {
+			return e === isRegexMarker;
+		}
 	}
+	: function isRegex(value) {
+		// In older browsers, typeof regex incorrectly returns 'function'
+		if (!value || (typeof value !== 'object' && typeof value !== 'function')) {
+			return false;
+		}
 
-	return tryRegexExecCall(value);
-};
+		return toStr.call(value) === regexClass;
+	};