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Added SED character classes

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Michele Cereda
2022-09-07 13:20:01 +02:00
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knowledge base/sed.md
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@@ -15,8 +15,27 @@ sed /etc/fstab \
-e '/#.*\s*swap\s*.*/d'
```
## Character classes and bracket expressions
| Class | Description |
| ----- | ----------- |
| `[[:alnum:]]` | alphanumeric characters `[[:alpha:]]` and `[[:digit:]]`; this is the same as `[0-9A-Za-z]` in the `C` locale and ASCII character |
| `[[:alpha:]]` | alphabetic characters `[[:lower:]]` and `[[:upper:]]`; this is the same as `[A-Za-z]` in the `C` locale and ASCII character encoding |
| `[[:blank:]]` | blank characters `space` and `tab` |
| `[[:cntrl:]]` | control characters; in ASCII these characters have octal codes 000 through 037 and 177 (DEL), in other character sets these are the equivalent characters, if any |
| `[[:digit:]]` | digits `0` to `9` |
| `[[:graph:]]` | graphical characters `[[:alnum:]]` and `[[:punct:]]` |
| `[[:lower:]]` | lower-case letters `a` to `z` in the `C` locale and ASCII character encoding |
| `[[:print:]]` | printable characters `[[:alnum:]]`, `[[:punct:]]` and `space` |
| `[[:punct:]]` | punctuation characters `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`, `*`, `+`, `,`, `-`, `.`, `/`, `:`, `;`, `<`, `=`, `>`, `?`, `@`, `[`, `\`, `]`, `^`, `_`, `` ` ``, `{`, `\|`, `}` and `~` in the `C` locale and ASCII character encoding |
| `[[:space:]]` | space characters `tab`, `newline`, `vertical tab`, `form feed`, `carriage return` and `space` in the `C` locale |
| `[[:upper:]]` | upper-case letters `A` to `Z` in the `C` locale and ASCII character encoding |
| `[[:xdigit:]]` | hexadecimal digits `0` to `9`, `A` to `F` and `a` to `f` |
## Further readings
- [GNU SED Online Tester]
- [Character Classes and Bracket Expressions]
[character classes and bracket expressions]: https://www.gnu.org/software/sed/manual/html_node/Character-Classes-and-Bracket-Expressions.html
[gnu sed online tester]: https://sed.js.org/