cheat_sheets_regex
This is an old revision of the document!
Table of Contents
RegEx
Anchors
| Syntax | Description |
|---|---|
| ^ | Start of string, or start of line in multi-line pattern |
| $ | End of string, or end of line in multi-line pattern |
Quantifiers
| Syntax | Description |
|---|---|
| * | 0 or more |
| ? | 0 or 1 |
| + | 1 or more |
| {3} | Exactly 3 |
| {3,} | 3 or more |
| {3,5} | 3, 4 or 5 |
| note | Add a ? to a quantifier to make it ungreedy |
Escape
| Syntax | Description |
|---|---|
| \ | Escape following character |
Escaping is a way of treating characters which have a special meaning in regular expressions literally, rather than as special characters.
Groups and Ranges
| Syntax | Description | |
|---|---|---|
| . | Any character except new line (\n) | |
| (a | b) | a or b |
| (…) | Group, capturing | |
| (?:…) | Passive (non-capturing) group | |
| [abc] | Range (a or b or c) | |
| [ | abc] | Not (a or b or c) |
| [a-q] | Lower case letter from a to q | |
| [A-Q] | Upper case letter from A to Q | |
| [0-7] | Digit from 0 to 7 |
cheat_sheets_regex.1664114981.txt.gz · Last modified: by gman