Online Tool Store
Regex Cheat Sheet
Browse and search common regular expression tokens — character classes, anchors, quantifiers, groups, and flags — each with a short example. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Character classes
. Any character except newline
a.c matches "abc", "a1c"
\d Any digit (0-9)
\d+ matches "123"
\D Any non-digit
\D+ matches "abc"
\w Word character (letter, digit, underscore)
\w+ matches "hello_1"
\W Non-word character
\W matches "!", " "
\s Whitespace (space, tab, newline)
\s+ matches " "
[abc] Any one of a, b, or c
[abc]+ matches "cab"
[^abc] Any character except a, b, or c
[^abc] matches "d"
[a-z] Any lowercase letter
[a-z]+ matches "hello"
Anchors
^ Start of string (or line, with the m flag)
^Hello matches "Hello world"
$ End of string (or line, with the m flag)
world$ matches "Hello world"
\b Word boundary
\bcat\b matches "a cat sat" not "concatenate"
Quantifiers
* Zero or more
ab*c matches "ac", "abc", "abbbc"
+ One or more
ab+c matches "abc" not "ac"
? Zero or one
colou?r matches "color" and "colour"
{n} Exactly n times
\d{3} matches "123"
{n,} n or more times
\d{2,} matches "12", "123"
{n,m} Between n and m times
\d{2,4} matches "12" to "1234"
Groups & alternation
(abc) Capturing group
(ab)+ captures repeated "ab"
(?:abc) Non-capturing group
(?:ab)+c groups without capturing
(?<name>abc) Named capturing group
(?<year>\d{4}) captures as "year"
a|b Match a or b
cat|dog matches "cat" or "dog"
Flags
g Global — find all matches, not just the first
/a/g
i Case-insensitive
/hello/i matches "HELLO"
m Multiline — ^ and $ match line boundaries
/^a/m
s Dot matches newline too
/a.b/s
How it works
- Browse tokens grouped by category — character classes, anchors, quantifiers, groups, and flags.
- Search to filter to the token or concept you need.
- Each entry includes a short example of what it matches.
FAQ
Is this specific to one programming language?
It covers the common syntax shared across most modern regex flavors (JavaScript, Python, PCRE). A handful of features (like named groups) vary slightly in exact syntax between languages.
Can I test these patterns live?
Not on this page — pair it with Regex Tester to try any of these tokens against your own text.
Is my search query sent anywhere?
No — filtering happens entirely in your browser.
How we compare
| Feature | Online Tool Store | Searching each time online | Memorizing syntax |
|---|---|---|---|
| Everything on one searchable page | ✓ | ✗ | ✓ |
| No ads or unrelated results | ✓ | ✗ | ✓ |
Searching for regex syntax each time you forget it wastes time. Regex Cheat Sheet keeps the common tokens in one searchable page.