1.截取字符串中指定内容
{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"-4","WD":"西北风","WS":"2级","SD":"29%","WSE":"2","time":"09:40","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB"}}
string pattern = "{\"weatherinfo\":(.*)}";
var result = Regex.Match(weatherQueryResult, pattern, RegexOptions.IgnoreCase).Groups;
返回结果为{"city":"北京","cityid":"101010100","temp":"-4","WD":"西北风","WS":"2级","SD":"29%","WSE":"2","time":"09:40","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB"}
2.截取字符串中的数字
string s = "B123-C12";
MatchCollection vMatchs = Regex.Matches(s, @"(\d+)");
vMatchs[0].Value
返回结果 123，12
3.截取字符串中的字母
string str = "呵呵呵呵aB-cFe-sdfEww";
MatchCollection m = Regex.Matches(str, @"[A-Z]+");//小写字母为a-z 大小写混合为a-zA-Z
返回结果为B/F/E
