bayoso wrote:其实我不同这些规则的编写,比如“+”这个干什么的,我不知道,请问有没有什么讲规则的文章。
加号是用来匹配的,帮助文件里面这样描述的:
+ The plus sign indicates a run of repeating characters. For instance, "a+" would match "a", "aa", or "aaaa". You can use it after other meta characters or parenthesis for more complex runs. For example...
[abc]+ would match a run of any characters "a","b",or "c" like "ababccba"
([a-z]&[^n])+ would match a run of letters "a" through "z" but not "n"
(foo)+ would match "foo", "foofoo", "foofoofoo", etc.
An important point to make about + is that it's a "blind" run. This means it repeats at long as the condition it's testing is true regardless of anything the follows it! For example "(foo)+foobar" could never match. Why? well the loop will eat up all the "foo's" their are leaving no "foo" for "foobar"! This can actually be very useful sometimes, but if it's not what you want try "++" instead.
论坛里面有人翻译过中文的,这样描述的:
+ 加号表示连续重复的字符。例如:"a+" 可匹配 "a", "aa"以及 "aaaa"。复杂一点的如:
【The plus sign indicates a run of repeating characters. For instance, "a+" would match "a", "aa", or "aaaa". You can use it after other meta characters or parenthesis for more complex runs. For example...】
[abc]+ 可以匹配 "a","b"以及 "c" 诸如 "ababccba"这样
([a-z]&[^n])+ 可以匹配"a"到 "z"的任意字母但除了 "n"
(foo)+ 匹配"foo", "foofoo", "foofoofoo"等等
An important point to make about + is that it's a "blind" run. This means it repeats at long as the condition it's testing is true regardless of anything the follows it! For example "(foo)+foobar" could never match. Why? well the loop will eat up all the "foo's" their are leaving no "foo" for "foobar"! This can actually be very useful sometimes, but if it's not what you want try "++" instead.
如果你偏好中文的话,可以看别人翻好的一部分帮助文件:
http://forum.proxomitron.cn/viewtopic.php?f=2&t=103
或者看程序自带的英文帮助文件