C# 正则表达式提取字符串中括号里的值

version = regex.replace(str, @"(.*\()(.*)(\).*)", "$2"); //小括号()
    
regex rgx = new regex(@"(?i)(?<=\[)(.*)(?=\])");//中括号[]
string tmp = rgx.match(cvoname).value;//中括号[]
    
string sheetdata = regex.match(linkdata, @"\{(.*)\}", regexoptions.singleline).groups[1].value;//大括号{}