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Tran Hau 2020-05-01 20:40:49 +07:00
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Brain/regex.md
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@ -4,29 +4,29 @@ Read [Syntax](https://github.com/google/re2/wiki/Syntax).
Read [Golang-Regex-Tutorial](https://github.com/StefanSchroeder/Golang-Regex-Tutorial).
| regex | meaning |
| ------- | ----------------------------------------- |
| `.` | any character, default not including `\n` |
| `[xy]` | `x` or `y` character |
| `[^xy]` | not `x` and `y` character |
| \| | `x` or `y` |
| `x*` | 0 or more `x`, prefer **more** |
| `x+` | 1 or more `x`, prefer **more** |
| `x?` | 0 or 1 `x` , prefer 1 |
| `x*?` | 0 or more `x`, prefer **fewer** |
| `x+?` | 1 or more `x`, prefer **fewer** |
| `^` | at beginning of text |
| `$` | at end of text |
| `\d` | digits |
| `\D` | not digits |
| `\s` | whitespace |
| `\S` | not whitespace |
| regex | meaning |
| -------- | ----------------------------------------- |
| `.` | any character, default not including `\n` |
| `[xy]` | `x` or `y` character |
| `[^xy]` | not `x` and `y` character |
| `x`\|`y` | `x` or `y` |
| `x*` | 0 or more `x`, prefer **more** |
| `x+` | 1 or more `x`, prefer **more** |
| `x?` | 0 or 1 `x` , prefer 1 |
| `x*?` | 0 or more `x`, prefer **fewer** |
| `x+?` | 1 or more `x`, prefer **fewer** |
| `^` | at beginning of text |
| `$` | at end of text |
| `\d` | digits |
| `\D` | not digits |
| `\s` | whitespace |
| `\S` | not whitespace |
| advanced regex | meaning |
| -------------- | ----------------------------------- |
| `(foo)` | numbered capturing group (submatch) |
| `(?:foo)` | non capturing group |
| `(?:x|y)` | `x` or `y` expression wrap in `()` |
| `(?:x`\|`y)` | `x` or `y` expression wrap in `()` |
| `(?flags)` | set flags within current group |
| flag | meaning |