Never save something for a special occasion. Every day in your life is a special occasion.
分类:
2010-09-13 19:49:52
Expression |
Description |
\t |
Tab character. |
\n |
New line. |
. |
Matches any character. |
| |
Either expression on its left and right side matches the target string. For example, "a|b" matches "a" and "b". |
[] |
Any of the enclosed characters may match the target character. For example, "[ab]" matches "a" and "b". "[0-9]" matches any digit. |
[^] |
None of the enclosed characters may match the target character. For example, "[^ab]" matches all character EXCEPT "a" and "b". "[^0-9]" matches any non-digit character. |
* |
Character to the left of asterisk in the expression should match 0 or more times. For example "be*" matches "b", "be" and "bee". |
+ |
Character to the left of plus sign in the expression should match 1 or more times. For example "be+" matches "be" and "bee" but not "b". |
? |
Character to the left of question mark in the expression should match 0 or 1 time. For example "be?" matches "b" and "be" but not "bee". |
^ |
Expression to the right of ^ matches only when it is at the beginning of line. For example "^A" matches an "A" that is only at the beginning of line. |
$ |
Expression to the left of $ matches only when it is at the end of line. For example "e$" matches an "e" that is only at the end of line. |
() |
Affects evaluation order of expression and also used for tagged expression. |
\ |
Escape character. If you want to use character "\" itself, you should use "\\". |
Original |
Search |
Replace |
Result |
abc |
(ab)(c) |
\0-\1-\2 |
abc-ab-c |
abc |
a(b)(c) |
\0-\1-\2 |
abc-b-c |
abc |
(a)b(c) |
\0-\1-\2 |
abc-a-c |