System.Text.RegularExpressions ... [英] System.Text.RegularExpressions...

问题描述

大家好，



i想要满足条件，如果rawValue包含文本或Empty.but它给我错误

错误15' System.Text.RegularExpressions.Regex'是'type'，但用作'变量'

Hi Everyone,

i want to satisfy the condition if rawValue contains text or Empty.but its give me error
Error 15 'System.Text.RegularExpressions.Regex' is a 'type' but is used like a 'variable'

public static string ExtractValue(string rawValue)
        {
            if (rawValue == string.Empty || rawValue == Regex)
            {
                return null;
            }
            else
            {
                return new Regex(@"[a-zA-z\s]*").Replace(rawValue, string.Empty);
            }
        }

请让我知道为什么会这样。

提前致谢

Harshal

Please let me know why is this happen .
Thanks in Advance
Harshal

推荐答案

正是因为这行 rawValue == Regex

如果你想匹配你的rawValue匹配Regex表达式你可以这样做

It is because of this line rawValue == Regex
If you want to match your rawValue matches Regex expression you can do it like this

Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
  MatchCollection matches = rgx.Matches(input);
  if (matches.Count > 0)
  {
     //code
  }

查看有关 Regex Class

嗯。

正则表达式是一种类型，所以你无法比较带有它的字符串：

Um.
Regex is a type, so you can't compare a string with it:

if (rawValue == string.Empty || rawValue == Regex)
{
    return null;
}

无效。

代替，尝试开始：

Won't work.
instead, try starting with:

if (string.IsNullOrWhiteSpace(rawValue))
{
    return null;
}

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