Regular expression for matching valid JavaScript identifiers
npm install identifier-regeximport identifierRegex from 'identifier-regex';
identifierRegex().test('foo');
//=> true
identifierRegex().test('1kg');
//=> false
identifierRegex().test('await'); // Reserved identifier
//=> false
'@x $x #x'.match(identifierRegex({exact: false}));
//=> ['$x']Important
If you run the regex against untrusted user input in a server context, you should give it a timeout. I do not consider ReDoS a valid vulnerability for this package.
Note
Although globalThis, Infinity, NaN, and undefined are properties of the global object and not identifiers, they are not matched by the regex because they should generally not be used as identifiers.
Returns a RegExp for matching valid JavaScript identifiers.
Type: object
Type: boolean
Default: true
Only match an exact string.
- is-identifier - Check if a string is a valid JavaScript identifier
