Checks if any value is a regular expression of the type obtained from its object class equal to 'regexp', or an object type, and an instance of RegExp.

const isRegExp = <Payload extends object>(
  value: any,
  callback: ResultCallback<any, Payload> = resultCallback,
  payload?: Payload
): value is RegExp =>
    (typeOf(value) === 'regexp' || typeof value === 'object') &&
      value instanceof RegExp,

Generic type variables


The Payload generic type variable constrained by object indicates the type of optional parameter payload of the supplied callback function and payload optional parameter of the isRegExp() function from which it captures its value.


value: any

The value of any type to check.

callback: ResultCallback<any, Payload>

A callback function of ResultCallback type with parameters, the value that has been checked, the result of this check, and payload of generic type variable Payload with optional properties from the provided payload, to handle them before the result return. By default, it uses resultCallback() function.

payload?: Payload

An optional object of the generic type variable Payload is assigned to the payload of the given callback function.

Return type

value is RegExp

The return type is a boolean as the result of its statement indicating the value is a regular expression of a RegExp.


The return value is a boolean indicating whether the provided value is a regular expression.

Example usage

// Example usage.
import { isRegExp } from '@angular-package/type';

isRegExp(/[^a-z]/g); // true; The return type `value is RegExp`

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