如何检查文件名是否包含GUID [英] How to check whether a file name contains GUID or not

问题描述

文件名是text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt

它应该返回true，因为它包含GUID



如果文件名是text1eb4617fd-4876-f8.txt或text1.txt

它应该返回false，因为它不包含任何GUID

解决方案

正则表达式将是完美的：

 使用系统。文本; 
 
  string  pattern =  @  ^文本（小于GUID> [0-9A-ZA-Z] {8}  -  [0-9A-ZA-Z] {4}  -  [0-9A-ZA-Z] {4}  -  [0 -9a-ZA-Z] {4}  -  [0-9A-ZA-Z] {12}）\.txt 

;

正则表达式regex = 新正则表达式（模式，RegexOptions.Compile | RegexOptions.CultureInvariant）;

string input1 = text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt;
string input2 = texteb4617fd-4876- 4c52-aa5b-21f8be8fb0f8.txt;

bool input1Matches = regex.IsMatch（input1）; // input1Matches将为false
bool input2Matches = regex.IsMatch（input2）; // input2Matches将为true

As奖金，如果你想获得Guid，它很简单：

匹配m = regex.Match（input2）; 
 Guid guid = Guid.Parse（m.Groups [  Guid]。价值） ; 

注意：您呈现的Guid不是有效的：它的第一个块应该只包含4个字节，但您提供的示例需要5个字节来存储1eb4617fd 。这就是为什么我在我的例子中使用了两个字符串变量。



希望这会有所帮助。

试试这个

 受保护  void  Page_Load（对象发​​件人，EventArgs e）
 {
 
  bool  a = IsHavingGUID（  text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt）; 
  bool  b = IsHavingGUID（  text1。 TXT）; 
} 
 
  public   bool  IsHavingGUID（ string  input）
 {
 MatchCollection guids = Regex.Matches（input， @ （\ {）{0,1} [0-9A-FA-F] {8} \- [0-9A-FA-F] {4} \- [0-9A -Fa-F] {4} \- [0-9A-FA-F] {4} \- [0-9A-FA-F] {12}（\}）{0,1}< /跨度>）; 
 返回 guids.Count> 0; 
} 

File name is text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt
it should return true because it contains GUID

If File name is text1eb4617fd-4876-f8.txt or text1.txt
it should return false as it does not contain any GUID

解决方案

A regular expression would be perfect for that:

using System.Text;

string pattern = @"^text(?<guid>[0-9a-zA-Z]{8}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{12})\.txt

"; Regex regex = new Regex(pattern, RegexOptions.Compile | RegexOptions.CultureInvariant); string input1 = "text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt"; string input2 = "texteb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt"; bool input1Matches = regex.IsMatch(input1); // input1Matches will be false bool input2Matches = regex.IsMatch(input2); // input2Matches will be true

As a bonus, if you want to get the Guid, it is a simple as:

Match m = regex.Match(input2);
Guid guid = Guid.Parse(m.Groups["Guid"].Value);

Note: the Guid you are presenting is not a valid one: its first block should hold exactly 4 bytes, buty the example you give would need 5 bytes to store 1eb4617fd. That's why I used two string variables in my example.

Hope this helps.

Try This one

protected void Page_Load(object sender, EventArgs e)
   {

       bool a = IsHavingGUID("text1eb4617fd-4876-4c52-aa5b-21f8be8fb0f8.txt");
       bool b = IsHavingGUID("text1.txt");
   }

   public bool IsHavingGUID(string input)
   {
       MatchCollection guids = Regex.Matches(input, @"(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}");
      return guids.Count>0;
   }

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