Lesson Notes:
| abc… | letters |
|---|---|
| 123… | digits |
| \d | Any Digit |
| \D | Any Non-digit character |
| . | Any Character |
| \. | Period |
| [abc] | Only a, b, or c |
| [^abc] | Not a, b nor c |
| [a-z] | Characters a to z |
| [0-9] | Numbers 0 to 9 |
| \w | Any Alphanumeric character |
| \W | Any Non-alphanumeric character |
| {m} | m Repetitions |
| {m,n} | m to n Repetitions |
| * | Zero or more repititions |
| + | One or more repititions |
| ? | Optional character |
| \s | Any Whitespace |
| \S | Any Non-whitespace character |
| ^…$ | Starts and ends |
| (…) | Capture Group |
| (a(bc)) | Capture Sub-group |
| (.*) | Capture all |
| (abc|def) | Matches abc or def |
| \b | Martches the boundary between a word and a non-word character |
| \0,\1,\2… | Reference your captured groups |
文档信息
- 本文作者：weownthenight
- 本文链接：https://weownthenight.github.io/2021/06/02/%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F/
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