Regex Cheatsheet
Quick regex syntax cheatsheet for developers.
Anchors
| Pattern | Meaning |
|---|---|
| ^ | Start of string |
| $ | End of string |
| \b | Word boundary |
Quantifiers
| Pattern | Meaning |
|---|---|
| * | 0 or more |
| + | 1 or more |
| ? | 0 or 1 |
| {n} | Exactly n |
| {n,} | n or more |
| {n,m} | Between n and m |
Character classes
| Pattern | Meaning |
|---|---|
| . | Any char (except newline) |
| \d | Digit [0-9] |
| \D | Non-digit |
| \w | Word [a-zA-Z0-9_] |
| \s | Whitespace |
| [abc] | Any of a,b,c |
| [^abc] | Not a,b,c |
| [a-z] | Range a to z |
Groups
| Pattern | Meaning |
|---|---|
| (x) | Capturing group |
| (?:x) | Non-capturing |
| (?<name>x) | Named group |
| | | Alternation (or) |
Escapes
| Pattern | Meaning |
|---|---|
| \n | Newline |
| \t | Tab |
| \\ | Backslash |
| \. | Literal . |
Flags
| Pattern | Meaning |
|---|---|
| g | Global |
| i | Case insensitive |
| m | Multiline |
| s | Dotall |
What is Regex Cheatsheet?
Reference for common regex syntax: anchors, quantifiers, character classes, groups, and flags.
FAQ
Is this tool free to use?
Yes. This tool is available to use for free.
Does the tool run in the browser?
Yes. The logic runs client-side in your browser.
Is my data uploaded to a server?
No. Your input stays in your browser and is not uploaded by this tool.
Can I use this tool for large files?
It depends on your device and browser. Very large inputs may be slow; for huge files, use a local CLI tool.
How to use
- Use the table as a quick reference while writing regex