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  1. using System;
  2. using System.Text.RegularExpressions;
  3. using System.IO;
  4. using System.Linq;
  5. public class Test
  6. {
  7. 	public static readonly Regex rxQuoted = new Regex(@"""([^""\\]*(?:\\.[^\\""]*)*)""");
  8. 	public static void Main()
  9. 	{
  10. 		// 1. Regex: \b(?:to\ background)\b, Match: N/A
  11. 		checkIt("to background", "I need to find a string in this sentence!");
  12. 		// 2. Regex: \b(?:to|background)\b, Match: to
  13. 		checkIt("\"to\" \"background\"", "I need to find a string in this sentence!");
  14. 		// 3. Regex: \b(?:to\ find)\b, Match: to find
  15. 		checkIt("\"to find\"", "I need to find a string in this sentence!");
  16. 	}
  17. 	public static void checkIt(string searchString, string sentence)
  18. 	{
  19. 		var lst = rxQuoted.Matches(searchString)
  20. 				.Cast<Match>()
  21. 				.Select(p => Regex.Escape(p.Groups[1].Value))
  22. 				.ToList(); 
  23. 	    var pattern = lst.Count > 0 ? 
  24. 				@"\b(?:" + String.Join("|", lst) + @")\b" :
  25. 				@"\b(?:" + Regex.Escape(searchString) + @")\b";
  26. 	    Console.WriteLine("Regex: " + pattern);
  27.  
  28. 		Match match = Regex.Match(sentence, pattern);
  29. 		if (match.Success)
  30. 		{
  31.     		Console.WriteLine("Match value: " + match.Value);
  32. 		}
  33. 	}
  34. }
Success #stdin #stdout 0.13s 24696KB
comments (?)
stdin 
Standard input is empty
stdout 
Regex: \b(?:to\ background)\b
Regex: \b(?:to|background)\b
Match value: to
Regex: \b(?:to\ find)\b
Match value: to find
https://ideone.com/34fe7V
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
secret

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