feat: add "Lab4.FirstEqualLast" using regex

Lab4.FirstEqualLast/Program.cs

@@ -8,7 +8,7 @@ namespace Lab4.FirstEqualLast
 		public static void Main(string[] args)
 		{
 			const string CFd = "Duomenys.txt";
-			char [] punctuation = {' ','.',',','!','?',':',';','(',')','\t'};
+			string punctuation = "[\\s,.;:!?()\\-]+";
 			Console.WriteLine("Sutampančių žodžių {0, 3:d}", TaskUtils.Process(CFd, punctuation));
 		}
 	}

Lab4.FirstEqualLast/TaskUtils.cs

@@ -1,11 +1,41 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using System.Text.RegularExpressions;
 
 namespace Lab4.FirstEqualLast
 {
 	public class TaskUtils
 	{
+		/** Reads file and finds the number of words having same the first and
+			the last letters.
+			@param fin – name of data file 
+			@param punctuation – punctuation marks to separate words */
+		public static int Process(string fin, string punctuation)
+		{
+			string[] lines = File.ReadAllLines(fin, Encoding.UTF8);
+			int equal = 0;
+			foreach (string line in lines)
+				if (line.Length > 0)
+					equal += FirstEqualLast(line, punctuation);
+				return equal;
+			}
+
+		/** Splits line into words and counts the words having same the first
+			and the last letters.
+			@param line – string of data
+			@param punctuation – punctuation marks to separate words */
+		private static int FirstEqualLast (string line, string punctuation)
+		{
+			string[] parts = Regex.Split(line, punctuation);
+			int equal = 0;
+			foreach (string word in parts)
+				if(word.Length > 0) // empty words at the end of line
+					if (word[0] == word[word.Length - 1])
+						equal++;
+			return equal;
+		}
+
 		/** Reads file and finds the number of words having same the first and
 			the last letters.
 			@param fin – name of data file
@@ -15,8 +45,8 @@ namespace Lab4.FirstEqualLast
 			string[] lines = File.ReadAllLines(fin, Encoding.UTF8);
 			int equal = 0;
 			foreach (string line in lines)
-			if (line.Length > 0)
+				if (line.Length > 0)
-			equal += FirstEqualLast(line, punctuation);
+					equal += FirstEqualLast(line, punctuation);
 			return equal;
 		}