C# 对字符串操 替换数字 替换非数字 去除首尾字符

一、去除首尾字符串

 ///<summary>
 /// 截前后字符(串)
 ///</summary>
 ///<param name="val">原字符串</param>
 ///<param name="str">要截掉的字符串</param>
 ///<param name="all">是否贪婪</param>
 ///<returns></returns>
        private string GetString(string val,string str,bool all)
        {
            return Regex.Replace(val, @"(^(" + str + ")" + (all ? "*" : "") + "|(" + str + ")"+(all ? "*" : "") + "$)", "");
        }

二、去除首尾字符

        /// <summary>
        /// 
        /// </summary>
        /// <param name="val">原字符串</param>
        /// <param name="c">要截取的字符</param>
        /// <returns></returns>
        private string GetString(string val,char c)
        {
            return val.TrimStart(c).TrimEnd(c);
        }

 三、去掉字符串中的数字

/// <summary>
/// 去掉字符串中的数字
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static string RemoveNumber(string key)
{
    return System.Text.RegularExpressions.Regex.Replace(key, @"\d", "");
}

四、去掉字符串中的非数字

/// <summary>
/// 去掉字符串中的非数字
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static string RemoveNotNumber(string key)
{
    return System.Text.RegularExpressions.Regex.Replace(key, @"[^\d]*", "");
}