正则表达式匹配和字符串通配符c＃ [英] Regex Match and string wildcards c#

问题描述

我遇到了这行代码并想知道是否有人可以解释字符串通配符@_？< test> \w +）+。usf在这行代码中是什么意思？

I came across this line of code and wondering if anyone can explain what the string wildcard @"_?<test>\w+)+.usf" means in this line of code?

string Participant

Match filematch = Regex.Match(file.Name, Participant + @"_(?<test>\w+)+.usf");  

谢谢！

Thanks!

推荐答案

@只是意味着从字面上取字符串所以你不需要逃避特殊字符。

_是字面下划线字符。

？意味着前一个模式可能不存在或一次

\ w是任何字母数字或下划线字符

+表示它可以存在1次或多次

）是一个紧密的括号。由于没有开括号，这将是错误的。 char应该被转义为'\）'

。将匹配除新行之外的任何字符

usf意味着字符串应该有一个usf



除了正则表达式被破坏之外，正则表达式匹配：



_abcd_efg_h＃usf



它会在其他文本中找到此匹配：



sgfsjgfsjfg＃ _abcd_efg_h＃usf ksdfksdjfhksdfh



i认为你可能想要修复'。'使其成为'\。'，它与文字'。'字符匹配，但我想这里有很多其他问题。



希望有所帮助^ _ ^

Andy

@ just means to take the string literally so you don't need to escape special chars.
_ is a literal underscore char.
? means that the previous pattern may exist none or one times
\w is any alphanumeric or underscore char
+ means it can exist 1 or many times
) is a close parenthesis. As there is no open parenthesis, this will error. The char should be escaped to be literal like '\)'
. will match any char except new line
usf means that the string should have a usf

other than the fact that the regex is broken, the regex would match:

_abcd_efg_h#usf

it will find this match in other text:

sgfsjgfsjfg#_abcd_efg_h#usfksdfksdjfhksdfh

i think that you may want to fix the '.' to make it a '\.' which would match the literal '.' char, but I imagine there are lots of other issues here.

Hope that helps ^_^
Andy

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