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The toString() method of RegExp instances returns a string representing this regular expression.

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The RegExp.rightContext static accessor property returns the substring following the most recent match. RegExp["$'"] is an alias for this property.

The RegExp.input static accessor property returns the string against which a regular expression is matched. RegExp.$_ is an alias for this property.

The flags accessor property of RegExp instances returns the flags of this regular expression.

The Math.atan() static method returns the inverse tangent (in radians) of a number, that is

The catch() method of Promise instances schedules a function to be called when the promise is rejected. It immediately returns another Promise object, allowing you to chain calls to other promise methods. It is a shortcut for then(undefined, onRejected).

The prototype property of AsyncGeneratorFunction.prototype is shared by all async generator functions. Its value is AsyncGenerator.prototype. Each async generator function created with the async function* syntax or the AsyncGeneratorFunction() constructor also has its own prototype property, whose prototype is AsyncGeneratorFunction.prototype.prototype. When the async generator function is called, its prototype property becomes the prototype of the returned async generator object.