正则表达式从字符串中获取值

Question

Im trying to get value from string 1-1:0.0.0(123123) Here is code

string str = "\r\n1-1:0.0.0(123123)\r\n";
string patt = @"1-1:0.0.0(\(.*?)\)\s";
Match match = Regex.Match(str, patt,RegexOptions.IgnoreCase);
string v = match.Groups[1].Value;

problem is that i dont get clear value = "(123123"
can someone explain why there is round bracket at beginning ? :/

Answer 1

Your opening-round-bracket match \\( is inside the start of your capture group ( .

Replace (\\( with \\(( .

Also replace 0.0.0 with 0\\.0\\.0 for good measure.

Answer 2

The escaping of the parenthesis is not correct.

Change your pattern to the following (note that the backslash is in front of the first opening ( ):

@"1-1:0.0.0\((.*?)\)\s";

Answer 3

Your escape character (\\( is misplaced:

Please try following

string str = "\r\n1-1:0.0.0(123123)\r\n";
string patt = @"1-1:0.0.0\((.*?)\)\s";
Match match = Regex.Match(str, patt, RegexOptions.IgnoreCase);
string v = match.Groups[1].Value;

This will print

123123

Answer 4

Your capturing group is (\\(.*?) , that is a pair of parentheses which creates the capturing group, with a content of \\(.*? - matching a literal opening parenthesis and a non-greedy sequence of any characters.

Also note that the . characters in your pattern are not matching literal dots, but any character, I point this out since the target string seems to contain dots.