isRegExp :: a → Boolean

Evaluates whether the given value is of type RegExp

import isRegExp from 'deep-waters/isRegExp';

isRegExp(/^foo$/); // → true
isRegExp(new RegExp(/^foo$/)); // → true

isRegExp("/^foo$/"]); // → false
isRegExp(null); // → false
isRegExp("foo"); // → false

isRegExp, like any other type validator, is mostly used in composed validators:

import isString from 'deep-waters/isString';
import matchesPattern from 'deep-waters/matchesPattern';

const isEmail = compose(

isRegExp is built on top of ofClass validator and rely on Object.prototype.toString to check on the received value type in order to avoid typeof weird behaviours and encouraging a runtime strict type validation.

Last updated