C＃，提取使用正则表达式或字符串分割

Question

阅读从这个问题的答案后弦：C# regex pattern to extract urls from given string - not full html urls but bare links as well我想知道这将是从文档中提取的URL，通过使用正则表达式匹配，或使用字符串分割方法的最快途径。

所以，你必须包含一个HTML文档的字符串，并要提取的网址。

正则表达式的方法是：

Regex linkParser = new Regex(@"\b(?:https?://|www\.)\S+\b", RegexOptions.Compiled | RegexOptions.IgnoreCase); 
string rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue"; 
foreach(Match m in linkParser.Matches(rawString)) 
    MessageBox.Show(m.Value); 

和字符串分割方法：

string rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue"; 
var links = rawString.Split("\t\n ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).Where(s => s.StartsWith("http://") || s.StartsWith("www.") || s.StartsWith("https://")); 
foreach (string s in links) 
    MessageBox.Show(s); 

哪一个是最高效的方式做到这一点？

Answer 1

拆分速度更快。下面是一些代码，你可以测试： dotnetfiddle link

using System; 
using System.Diagnostics; 
using System.Linq; 
using System.Text.RegularExpressions; 

public class Program 
{ 

    public void Main() 
    { 
     Stopwatch sw = new Stopwatch(); 

     sw.Start(); 

     for (int i=0; i < 500; i++) 
     { 
      Regex linkParser = new Regex(@"\b(?:https?://|www\.)\S+\b", RegexOptions.Compiled | RegexOptions.IgnoreCase); 
      string rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue"; 
     } 

     sw.Stop(); 

     var test1Time = sw.ElapsedMilliseconds; 


     sw.Reset(); 
     sw.Start(); 

     for (int i=0; i < 500; i++) 
     { 
      string rawString = "house home go www.monstermmorpg.com nice hospital http://www.monstermmorpg.com this is incorrect url http://www.monstermmorpg.commerged continue"; 
      var links = rawString.Split("\t\n ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).Where(s => s.StartsWith("http://") || s.StartsWith("www.") || s.StartsWith("https://")); 
     } 

     sw.Stop(); 

     var test2Time = sw.ElapsedMilliseconds; 

     Console.WriteLine("Regex Test: " + test1Time.ToString()); 
     Console.WriteLine("Split Test: " + test2Time.ToString()); 
    } 
}