我怎样才能获得正则表达式的某个细分？

Question

I have a simple string

testteststete(segment1)tete(segment2)sttes323testte(segment3)eteste

I need to get (segment2). Each segment may be any text. I tried to use this regex \\(.+\\) . But i get this result

How i can get (segment2)? PS: I want to get all of the segments in brackets

Answer 1

In C#, you can just match all the (...) substrings and then access the second one using Index 1:

var rx = @"\([^)]*\)";
var matches = Regex.Matches(str, rx).Cast<Match>().Select(p => p.Value).ToList();
var result = matches != null && matches.Count > 1 ? matches[1] : string.Empty;

See IDEONE demo

The regex matches

• \\( - an opening (
• [^)]* - 0 or more characters other than )
• \\) - a closing ) .

Answer 2

我无法对其进行测试，但这可能可以工作：

\([^\)]*\)

Answer 3

You can try to use this regex:

\(([^)]+)\)

REGEX DEMO

Answer 4

(?<=^[^()]*\([^)]*\)[^()]*\()[^)]*

You can simply use this. See Demo

Answer 5

var regex = new Regex(@"\(([^)]*)\)", RegexOptions.Compiled);
string secondMatch = regex.Matches(text).Cast<Match>()
    .Select(m => m.Value.Trim('(', ')'))
    .ElementAtOrDefault(1);