01
Looking up digits
Type "digit" into Search to instantly find \d (any digit) and \D (any non-digit) along with their plain-English descriptions.
Regex Cheat Sheet
Developer ToolsSearchable regex cheat sheet with anchors, quantifiers, groups and lookarounds — free.
About
About the Regex Cheat Sheet
A searchable quick reference for common regular expression syntax — character classes, anchors, quantifiers, groups, lookarounds and flags.
Developers use it as a quick memory-jog for a lookahead or group syntax they don't write every day, and students learning regular expressions use it to browse the building blocks in one place instead of digging through a long documentation page. It's one of many free developer tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.
Examples
Regex Cheat Sheet examples
3 worked examples
02
Finding lookahead syntax
Type "lookahead" to see the pattern (?=...) for a positive lookahead and (?!...) for a negative lookahead.
03
No matches
Type a word that isn't in the reference, like "xyzzy", and the table shows a clear "no matches" message instead of an empty screen.
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FAQ
Frequently asked questions
Quick answers to common questions about the Regex Cheat Sheet.
What does the Regex Cheat Sheet do?
It's a searchable reference table listing common regular expression syntax and what each piece means.
Is the Regex Cheat Sheet free to use?
Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.
Is my search safe when I use this tool?
Yes. The search runs entirely in your own browser against a built-in list — nothing is sent to a server.
What kind of syntax does it cover?
Character classes (\d, \w, \s and their negations), anchors (^ , $ , \b), quantifiers (* + ? {n,m}), character sets ([abc], [^abc], [a-z]), groups (capturing, non-capturing, named), backreferences, alternation, lookaheads and lookbehinds, and the common flags (g, i, m, s, u).
Does this reference match a specific regex flavor?
It reflects JavaScript's regular expression syntax, which is very close to what most other languages support for these common constructs, though some advanced features can differ between languages.
Can I search by what something does, not just its symbol?
Yes. Searching a word like "lookahead" or "digit" matches against the description as well as the pattern itself.
Is there a tool to actually test a pattern, not just look it up?
Yes — pair this cheat sheet with the Regex Tester, which runs a pattern against sample text and shows every match and capture group.
Can I use the Regex Cheat Sheet on my phone?
Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.