.

node_modules/is-regex/index.js

@@ -0,0 +1,39 @@
+'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 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;
+	}
+
+	var descriptor = gOPD(value, 'lastIndex');
+	var hasLastIndexDataProperty = descriptor && has(descriptor, 'value');
+	if (!hasLastIndexDataProperty) {
+		return false;
+	}
+
+	return tryRegexExecCall(value);
+};