正则表达式（＃，？，：）[a-zA-Z0-9] * _ *是什么意思？

我有一些旧的.NET代码，在一个SQL字符串正则表达式（＃，？，：）[a-zA-Z0-9] * _ *是什么意思？

System.Text.RegularExpressions.MatchCollection collection = 
System.Text.RegularExpressions.Regex.Matches(icmd.CommandText, 
"(#,?,:)[a-zA-Z0-9]*_*");

我不知道它是如何匹配的搜索参数。任何人都可以解释我？

来源

2014-01-09 moodym

不是解决你的问题，但我怀疑'（＃，:)'节错误，应该是'[＃?:]'。 – porges

是的，我认为你是对的，它可以帮助我很多 – moodym

看下面的图解释它。

enter image description here

UPDATE：在下面的代码#,,:abc12_匹配。

System.Text.RegularExpressions.MatchCollection collection = 
System.Text.RegularExpressions.Regex.Matches("#,,:abc12_", "(#,?,:)[a-zA-Z0-9]*_*");

来源

2014-01-09 07:24:14

供将来参考，你用什么应用程序生成了该图？ – norlesh

它适用于Javascript，但也适用于其他语言... http://www.regexper.com/ –

感谢您的帮助 – moodym

参考this对正则表达式有任何疑问。

在(#,?,:)[a-zA-Z0-9]*_*

1st Capturing group (#,?,:) 
# matches the character # literally 
,? matches the character , literally 
Quantifier: Between zero and one time, as many times as possible, giving back as needed [greedy] 

,: matches the characters ,: literally 
[a-zA-Z0-9]* match a single character present in the list below 
Quantifier: Between zero and unlimited times, as many times as possible, giving back as needed [greedy] 
a-z a single character in the range between a and z (case sensitive) 
A-Z a single character in the range between A and Z (case sensitive) 
0-9 a single character in the range between 0 and 9 


_* matches the character _ literally 
Quantifier: Between zero and unlimited times, as many times as possible, giving back as needed [greedy]

方式：？它可以匹配#,,:anycharactorstring，#,,:anycharactorstring_，#,:anycharactorstring，#,:anycharactorstring_____等

来源

2014-01-09 07:30:51

感谢您的帮助 – moodym

正则表达式（＃，？，：）[a-zA-Z0-9] * _ *是什么意思？

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