Regex \w — Match a Word Character

\w matches a single word character — [A-Za-z0-9_] in ASCII mode. It is extended in Unicode mode. Example: /\w/ on "foo_bar" matches f, o, o, _, b, a, r.

Key facts

Frequently asked questions

What does \w match?

A word character: [A-Za-z0-9_] in ASCII mode.

Does \w include the underscore?

Yes, _ is part of \w.

Related pages

• HTTP 200 OK
• HTTP 301 Moved Permanently
• HTTP 401 Unauthorized
• HTTP 403 Forbidden
• HTTP 404 Not Found
• HTTP 429 Too Many Requests
• HTTP 500 Internal Server Error
• HTTP 502 Bad Gateway

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