C Sharp: Difference between revisions

C Sharp (view source)

1,278 bytes added , 18 September 2019

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+==Usage==
+===Regular Expressions===
+Regex<br>
+[https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex?view=netframework-4.8 Reference]
+<syntaxhighlight lang="csharp">
+using System;
+using System.Text.RegularExpressions;
+public class Test
+{
+    public static void Main ()
+    {
+        // Define a regular expression for repeated words.
+        Regex rx = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",
+          RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        // Define a test string.
+        string text = "The the quick brown fox  fox jumps over the lazy dog dog.";
+        // Find matches.
+        MatchCollection matches = rx.Matches(text);
+        // Report the number of matches found.
+        Console.WriteLine("{0} matches found in:\n   {1}",
+                          matches.Count,
+                          text);
+        // Report on each match.
+        foreach (Match match in matches)
+        {
+            GroupCollection groups = match.Groups;
+            Console.WriteLine("'{0}' repeated at positions {1} and {2}",
+                              groups["word"].Value,
+                              groups[0].Index,
+                              groups[1].Index);
+        }
+    }
+}
+</syntaxhighlight>
 ==Multithreading==