A regular expression that only matches a valid Github username
npm install github-username-regex
A regular expression that only matches a valid Github username
``javascript
import githubUsernameRegex from 'github-username-regex';
githubUsernameRegex.test('john'); //=> true
githubUsernameRegex.test('john-due'); //=> true
githubUsernameRegex.test('john-due-'); //=> false
`
According to the form validation messages on Join Github page,
* Github username may only contain alphanumeric characters or hyphens.
* Github username cannot have multiple consecutive hyphens.
* Github username cannot begin or end with a hyphen.
* Maximum is 39 characters.
`
npm install github-username-regex
`
bower install github-username-regex
`javascript`
import githubUsernameRegex from 'github-username-regex';
Type: RegExp (/^a-z\d){0,38}$/i)
`javascripttrue
// Returns
githubUsernameRegex.test('a');
githubUsernameRegex.test('0');
githubUsernameRegex.test('a-b');
githubUsernameRegex.test('a-b-123');
githubUsernameRegex.test('a'.repeat(39));
// Returns false
githubUsernameRegex.test('');
githubUsernameRegex.test('a_b');
githubUsernameRegex.test('a--b');
githubUsernameRegex.test('a-b-');
githubUsernameRegex.test('-a-b');
githubUsernameRegex.test('a'.repeat(40));
Note that this module doesn't take reserved usernames into consideration. For example it matches help, about and pricing`, though they are reserved words and cannot be used as Github usernames.