Sha256: e12fd03813980bbbe8cf05e85ae8d4ae8d5a954984a61853a0ba657aa1a5fb6e
Contents?: true
Size: 1.19 KB
Versions: 30
Compression:
Stored size: 1.19 KB
Contents
"use strict";
var isToStringTagSupported = require("../lib/is-to-string-tag-supported")
, isPrototype = require("../prototype/is");
var regExpTest = RegExp.prototype.test
, objectToString = Object.prototype.toString
, objectTaggedString = objectToString.call(/a/);
module.exports = function (value) {
if (!value) return false;
// Sanity check (reject objects which do not expose common RegExp interface)
if (!hasOwnProperty.call(value, "lastIndex")) return false;
try {
if (typeof value.lastIndex !== "number") return false;
if (typeof value.test !== "function") return false;
if (typeof value.exec !== "function") return false;
} catch (error) {
return false;
}
// Ensure its native RegExp object (has [[RegExpMatcher]] slot)
if (isToStringTagSupported && typeof value[Symbol.toStringTag] === "string") {
// Edge case (possibly a regExp with custom Symbol.toStringTag)
try {
var lastIndex = value.lastIndex;
regExpTest.call(value, "");
if (value.lastIndex !== lastIndex) value.lastIndex = lastIndex;
return true;
} catch (error) {
return false;
}
}
if (objectToString.call(value) !== objectTaggedString) return false;
return !isPrototype(value);
};
Version data entries
30 entries across 29 versions & 2 rubygems