^(?<user>.+)这个到底匹配什么啊？

13378333 · **发表于 :** 2012-08-21 10:34

试了一下 <user>33 好像不行啊， :em20

枫叶饭团 · **发表于 :** 2012-08-21 10:48

代码:

ef>echo '<user>33' |grep -E '^(?<user>.+)'
<user>33

哪里不行了

枫叶饭团 · **发表于 :** 2012-08-21 10:54

引用:

If name is a valid sub pattern name but it didn't match anything (e.g. sub pattern "X", matching "b" against "(?P<X>a)?b") then an empty string is returned.

13378333 · **发表于 :** 2012-08-21 10:56

枫叶饭团写道:

代码:

ef>echo '<user>33' |grep -E '^(?<user>.+)'
<user>33

哪里不行了

感谢大神指点，感谢送出 :em11

13378333 · **发表于 :** 2012-08-21 11:36

枫叶饭团写道:

引用:

If name is a valid sub pattern name but it didn't match anything (e.g. sub pattern "X", matching "b" against "(?P<X>a)?b") then an empty string is returned.

?起啥作用啊

^(?<user>.+)这个到底匹配什么啊？

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