帮助正则表达式 [英] Help with a Regular Expression

问题描述

我需要编写正则表达式的帮助，该正则表达式将从以下字符串中获取值...

我需要尝试从此文本字符串中获取数字002. SysParaI是标识符.例如，当我看到"SysParaI"时，需要在下面的括号(002)中获取数字吗?

STRING [261]目录(\ FTP \ OSP_003 \)
STRING [9] FileName(SysParaI)
STRING [4] FileExtension(002)

I need help writing a regex that will get the value out off the following string...

I need to try to get the number 002 out of this text string. SysParaI is the identifier. For example when I see "SysParaI" I need to grab the number in the following paren (002)?

STRING[261] Directory(\FTP\OSP_003\)
STRING[9] FileName(SysParaI)
STRING[4] FileExtension(002)

推荐答案

您可以轻松而又

You can go simple and just

Regex r = new Regex(@"\(.*\)");
var e = r.Matches(s);

e是匹配项的集合，并且将包含()"

不会重发

e is a collection of matches, and will include the "()"

Will not requer

Regex r = new Regex(@"\((.*)\)");
var e = r.Match(s);

e.Groups将包含所有匹配项，第二项将是您的结果

e.Groups will contain all matches, the second item will your result

我认为与Regex 的prefix and suffix选项匹配可以用于仅提取所需的值如下所示:

I think the matching with prefix and suffix options of Regex can be used to extract only the required value from the parentheses as shown below:

string text = @"STRING[261] Directory(\FTP\OSP_003\)\nSTRING[9] FileName(SysParaI)\nSTRING[4] FileExtension(002)";
Match match = Regex.Match(text, @"(?<=\(SysParaI\)[^)(]*\()\d+(?=\))",
                 RegexOptions.CultureInvariant);
if (match.Success)
	Console.WriteLine (match.Value);
//Output
//002

可以在这里进行测试 http://regexhero.net/tester/ [

It can be tested here http://regexhero.net/tester/[^]

The above pattern does not match if there are spaces around 002 and/or SysParaI like ( SysParaI ) ( 002 ).

To match in such case the following pattern can be used.
(?<=\(\s*SysParaI\s*\)[^)(]*\(\s*)\d+(?=\s*\)

如果这是一个字符串，那么我认为"SysParaI\).*?\((\d+)\)"应该可以工作，如果您设置了RegexOptions.Multiline(请参阅有关

If this is a single string, I would think "SysParaI\).*?\((\d+)\)" should work, if you set RegexOptions.Multiline (see more about that here[^])

If each line is it''s own string, check the previous one for the presence of SysParaI then use "\((\d+)\)

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