C# 判断一字符串是否为合法数字（正则表达式）

判断一个字符串是否为合法整数(不限制长度)

public static bool IsInteger(string s)
{
      string pattern = @"^\d*$";
      return Regex.IsMatch(s,pattern);
}

判断一个字符串是否为合法数字(0-32整数)

public static bool IsNumber(string s)
{
      ,);
}

判断一个字符串是否为合法数字(指定整数位数和小数位数)

 /// <param name="s">字符串</param>
 /// <param name="precision">整数位数</param>
 /// <param name="scale">小数位数</param>
 /// <returns></returns>
public static bool IsNumber(string s,int precision,int scale)
{
     )&&(scale == ))
      {
            return false;
      }
      string pattern = @"(^\d{1,"+precision+"}";
       )
       {
            pattern += @"\.\d{0,"+scale+"}$)|"+pattern;
       }
       pattern += "$)";
       return Regex.IsMatch(s,pattern);
}