D.6. 日志代理

^ beginning of line 
$ end of line 
. match one char 
* match zero or more chars 
[] match one character set, e.g. '[Ff]oo' 
[^] match not in set '[^A-F]oo' 
+ match one or more of preceding chars 
? match zero or one of preceding chars 
| or, e.g. a|b 
() groups chars, e.g., (foo|bar) or (foo)+

^ beginning of line 
$ end of line 
. match one char 
* match zero or more chars 
[] match one character set, e.g. '[Ff]oo' 
[^] match not in set '[^A-F]oo' 
+ match one or more of preceding chars 
? match zero or one of preceding chars 
| or, e.g. a|b 
() groups chars, e.g., (foo|bar) or (foo)+