Fix date postfixes in "remove spaces" - thx Boulder08 :)

Fix #4129

libse/StringExtensions.cs

@@ -297,6 +297,26 @@ namespace Nikse.SubtitleEdit.Core
             return false;
         }
 
+        public static bool ContainsNumber(this string s)
+        {
+            if (s == null)
+            {
+                return false;
+            }
+
+            int max = s.Length;
+            for (int index = 0; index < max; index++)
+            {
+                var ch = s[index];
+                if (char.IsNumber(ch))
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         public static string RemoveControlCharacters(this string s)
         {
             int max = s.Length;

libse/Utilities.cs

@@ -2115,6 +2115,21 @@ namespace Nikse.SubtitleEdit.Core
                 text = text.Replace(" ." + Environment.NewLine, "." + Environment.NewLine);
             }
 
+            if (language == "en" && text.ContainsNumber())
+            {
+                // 1 st => 1st
+                text = new Regex(@"(1) (st)\b").Replace(text, "$1$2");
+
+                // 2 nd => 2nd
+                text = new Regex(@"(2) (nd)\b").Replace(text, "$1$2");
+
+                // 3 rd => 2rd
+                text = new Regex(@"(3) (rd)\b").Replace(text, "$1$2");
+
+                // 4 th => 4th
+                text = new Regex(@"([0456789]) (th)\b").Replace(text, "$1$2");
+            }
+
             if (language != "fr") // special rules for French
             {
                 if (text.Contains(" !"))

src/Test/Logic/UtilitiesTest.cs

@@ -595,6 +595,13 @@ namespace Test.Logic
             Assert.AreEqual("The time is 8.40.", s);
         }
 
+        [TestMethod]
+        public void RemoveUnneededSpacesBetweenNumbersDates()
+        {
+            string s = Utilities.RemoveUnneededSpaces("The 4 th and 1 st 3 rd and 2 nd.", "en");
+            Assert.AreEqual("The 4th and 1st 3rd and 2nd.", s);
+        }
+
         [TestMethod]
         public void CountTagInTextStringOneLetterString()
         {