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Regular Expressions Cheat Sheet.md
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@@ -12,30 +12,35 @@ https://serverdiscounter.com/blog/2026-01-26-regex-grundlagen
## Special Characters
| | |
| -------- | ------------------------------------------------------------------------------- |
| `\` | Escapet Sonderzeichen oder kennzeichnet eine spezielle Sequenz |
| `.` | Entspricht einem beliebigen einzelnen Zeichen mit Ausnahme eines Zeilenumbruchs |
| `^` | Matches the start of the string. |
| `$` | Matches the end of the string​ |
| `*` | Greedily matches 0 or more repetitions of the preceding RE. |
| `*?` | Matches 0 or more repetitions of the preceding RE. |
| `+` | Greedily matches 1 or more repetitions of the preceding RE. |
| `+?` | Matches 1 or more repetitions of the preceding RE. |
| `?` | Greedily matches 0 or 1 repetitions of the preceding RE. |
| `??` | Matches 0 or 1 repetitions of the preceding RE. |
| `A\|B` | Matches A, if A is unmatched then matches B, where A and B are arbitrary REs. |
| `{m}` | Matches exactly m many repetitions of the previous RE. |
| `{m,n}` | Greedily matches from m many to n many repetitions of the previous RE. |
| `{m,n}?` | Matches m many to n many repetitions of the previous RE. |
| | |
| ---------- | ------------------------------------------------------------------------------- |
| `\` | Escapet Sonderzeichen oder kennzeichnet eine spezielle Sequenz |
| `.` | Entspricht einem beliebigen einzelnen Zeichen mit Ausnahme eines Zeilenumbruchs |
| `^` | Matches the start of the string. |
| `$` | Matches the end of the string​ |
| `*` | Greedily matches 0 or more repetitions of the preceding RE. |
| `*?` | Matches 0 or more repetitions of the preceding RE. |
| `+` | Greedily matches 1 or more repetitions of the preceding RE. |
| `+?` | Matches 1 or more repetitions of the preceding RE. |
| `?` | Greedily matches 0 or 1 repetitions of the preceding RE. |
| `??` | Matches 0 or 1 repetitions of the preceding RE. |
| `A\|B` | Matches A, if A is unmatched then matches B, where A and B are arbitrary REs. |
| `{m}` | Matches exactly m many repetitions of the previous RE. |
| `{m,n}` | Greedily matches from m many to n many repetitions of the previous RE. |
| `{m,n}?` | Matches m many to n many repetitions of the previous RE. |
| `[...]` | Indicates a set of characters to match. |
| `[amk]` | Matches 'a', 'm', or 'k'. |
| [a-z] | Matches 'a' through 'z'. |
| `[a-f0-7]` | Matches 'a' through 'f' or '0' through '7'. |
| `[a\-z]` | Matches 'a', '-', or 'z'. |
​
[...] Indicates a set of characters to match.
[amk] Matches 'a', 'm', or 'k'.
[a-z] Matches 'a' through 'z'.
[a-f0-7] Matches 'a' through 'f' or '0' through '7'.
[a\-z] Matches 'a', '-', or 'z'.
[a-] Matches 'a' or '-'.
[-a] Matches 'a' or '-'.
[(+*)] Matches '(', '+', '*', or ')'. [] matches special characters literally.