Regex to restrict only second occurrence of open and close brackets using C#

I have a string "开发者_如何学运维(BETA) (Feb 27, 2011)"

I need to get the second occurrence of the open and close brackets using C#

It is probably easiest to match all (...) tokens and take the second:

MatchCollection matches = Regex.Matches(str, @"\(([^)]*)\)");

Getting the second match:

String second = matches[1].Groups[1].Value;

The regex assumes valid pairs of parentheses, and no nesting. It is pretty basic:

• \( - Opening.
• (...) - Capturing group, to easily extract the value.
• [^)]* - Content of the group - characters that are not (.
• \) - Closing.

Do you want it in regex? If not regex:

int n = text.indexOf("(");
if (n >= 0) {
    n = text.indexOf("(", n+1);
}

Regex:

\(.+?\)\s*(\(.+?\))

Notice the use of a following "?" to force non-aggressive mode. And you must have at least one character within the parentheses.