google_appengine/dev_appserver.py helloworld/ dev_appserver.py --clear_datastore helloworld/ appcfg.py update helloworld/
| Character classes | |
|---|---|
| . | any character except newline |
| \w \d \s | word, digit, whitespace |
| \W \D \S | not word, digit, whitespace |
| [abc] | any of a, b, or c |
| [^abc] | not a, b, or c |
| [a-g] | character between a & g |
| Anchors | |
| ^abc$ | start / end of the string |
| \b | word boundary |
| Escaped characters | |
| \. \* \\ | escaped special characters |
| \t \n \r | tab, linefeed, carriage return |
| \u00A9 | unicode escaped © |
| Groups & Lookaround | |
| (abc) | capture group |
| \1 | backreference to group #1 |
| (?:abc) | non-capturing group |
| (?=abc) | positive lookahead |
| (?!abc) | negative lookahead |
| Quantifiers & Alternation | |
| a* a+ a? | 0 or more, 1 or more, 0 or 1 |
| a{5} a{2,} | exactly five, two or more |
| a{1,3} | between one & three |
| a+? a{2,}? | match as few as possible |
| ab|cd | match ab or cd |
| . | 符合任一字元 |
| \d | 等於 [0-9] 數字 |
| \D | 等於 [^0-9] 非數字 |
| \s | 等於 [ \t\n\x0B\f\r] 空白字元 |
| \S | 等於 [^ \t\n\x0B\f\r] 非空白字元 |
| \w | 等於 [a-zA-Z_0-9] 數字或是英文字 |
| \W | 等於 [^a-zA-Z_0-9] 非數字與英文字 |
| [abc] | a、b或c |
| [^abc] | 非a、b、c的其它字元 |
| [a-zA-Z] | a到z或A到Z（範圍） |
| [a-d[m-p]] | a到d或m到p（聯集） |
| [a-z&&[def]] | d、e或f（交集） |
| [a-z&&[^bc]] | a到z，除了b與c之外（減集） |
| [a-z&&[^m-p]] | a到z且沒有m到p（a-lq-z）（減集） |
| X? | X出現一次或完全沒有 |
| X* | X出現零次或多次 |
| X+ | X出現一次或多次 |
| X{n} | X出現n次 |
| X{n,} | X出現至少n次 |
| X{n,m} | X出現至少n次，但不超過m次 |