Add GetLeftPart and GetRightPart string ext methods

Author: mythz

src/ServiceStack.Text/StringExtensions.cs

@@ -335,6 +335,42 @@ private static byte[] FastToUtf8Bytes(string strVal)
             return bytes;
         }
 
+        public static string GetLeftPart(this string strVal, char needle)
+        {
+            if (strVal == null) return null;
+            var pos = strVal.IndexOf(needle);
+            return pos == -1
+                ? strVal
+                : strVal.Substring(0, pos);
+        }
+
+        public static string GetLeftPart(this string strVal, string needle)
+        {
+            if (strVal == null) return null;
+            var pos = strVal.IndexOf(needle, StringComparison.OrdinalIgnoreCase);
+            return pos == -1
+                ? strVal
+                : strVal.Substring(0, pos);
+        }
+
+        public static string GetRightPart(this string strVal, char needle)
+        {
+            if (strVal == null) return null;
+            var pos = strVal.IndexOf(needle);
+            return pos == -1
+                ? strVal
+                : strVal.Substring(pos + 1);
+        }
+
+        public static string GetRightPart(this string strVal, string needle)
+        {
+            if (strVal == null) return null;
+            var pos = strVal.IndexOf(needle, StringComparison.OrdinalIgnoreCase);
+            return pos == -1
+                ? strVal
+                : strVal.Substring(pos + needle.Length);
+        }
+
         public static string[] SplitOnFirst(this string strVal, char needle)
         {
             if (strVal == null) return TypeConstants.EmptyStringArray;

tests/ServiceStack.Text.Tests/StringExtensionsTests.cs

@@ -16,6 +16,14 @@ public void Can_SplitOnFirst_char_needle()
             Assert.That(parts[1], Is.EqualTo("pass@w:rd"));
         }
 
+        [Test]
+        public void Can_GetLeftPart_and_GetLeftPart_char_needle()
+        {
+            var str = "user:pass@w:rd";
+            Assert.That(str.GetLeftPart(':'), Is.EqualTo("user"));
+            Assert.That(str.GetRightPart(':'), Is.EqualTo("pass@w:rd"));
+        }
+
         [Test]
         public void Can_SplitOnFirst_string_needle()
         {
@@ -24,6 +32,14 @@ public void Can_SplitOnFirst_string_needle()
             Assert.That(parts[1], Is.EqualTo("pass@w:rd"));
         }
 
+        [Test]
+        public void Can_GetLeftPart_and_GetLeftPart_string_needle()
+        {
+            var str = "user::pass@w:rd";
+            Assert.That(str.GetLeftPart("::"), Is.EqualTo("user"));
+            Assert.That(str.GetRightPart("::"), Is.EqualTo("pass@w:rd"));
+        }
+
         [Test]
         public void Can_SplitOnLast_char_needle()
         {