Regex Token Reference
Look up every regular-expression token — character classes, anchors, quantifiers, groups, lookaround, flags and escapes — in one searchable table, each with its name, a plain-English meaning and a short example. In your browser, free.
Every regular-expression token, explained with an example. Everything runs in your browser from a built-in reference — nothing is sent to the server.
| Token | Name | Description | Example |
|---|
About Regex Token Reference
The Regex Token Reference collects every regular-expression building block in one searchable table: character classes like \d and \w, anchors like ^ and \b, quantifiers like * and {2,4}, groups and backreferences, lookahead and lookbehind, flags such as i, g and m, and the escapes for special characters. Each token comes with its name, a plain-English meaning and a short example.
It is built for the moment you half-remember a token: you know a lookahead exists but not whether it is (?=…) or (?<=…), or you cannot recall if \b is a word boundary or a backspace. Search accepts the token itself, its name or a word from its meaning, so any of those clues finds the row.
The seven category filters — character classes, anchors, quantifiers, groups and references, lookaround, flags and modifiers, escapes and special — also make the table a compact study guide for reading other people’s patterns. Every token is copyable with one click, and the whole reference runs in your browser.
How to use Regex Token Reference
- Type a token (\d), a name (word boundary) or a meaning keyword (lookahead) into the search box.
- Or narrow the table by category: character classes, anchors, quantifiers, groups, lookaround, flags or escapes.
- Read the token’s plain-English description and its short usage example.
- Click the copy button to grab the exact token for your pattern.