提取字符串中字母数字方法

//提取数字
public static IList<int> GetNumberic(string str)
{
    IList<int> numbericList=new List<int>();
    MatchCollection ms = Regex.Matches(str, @"d+");
    foreach(Match m in ms)
    {
       numbericList.Add(m.Value);
    }
    return numbericList;
}
//提取字母
public static IList<string> GetStrings(string str)
{
    IList<string> strList=new List<string>();
    MatchCollection ms = Regex.Matches(str, @"D+");
    foreach(Match m in ms)
    {
       strList.Add(m.Value);
    }
    return strList;
}