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is-regex
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'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); };
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