Fix Term is upercase

Author: tinohager

src/Nager.EmailAuthentication.UnitTest/SpfRecordParserTest/FragmentParser/BasicTest.cs

@@ -73,5 +73,17 @@ public void Should_Parse_Spf_With_Multiple_Ip4_And_Include()
             Assert.IsNotNull(spfDataFragment.SpfTerms);
             Assert.AreEqual(7, spfDataFragment.SpfTerms.Length);
         }
+
+        [TestMethod]
+        public void Should_Parse_Spf_With_Ip4_Uppercase()
+        {
+            var spf = "v=spf1 IP4:155.56.66.96 IP4:155.56.66.102/31 -all";
+            var isSuccessful = SpfRecordDataFragmentParserV1.TryParse(spf, out var spfDataFragment);
+
+            Assert.IsTrue(isSuccessful);
+            Assert.IsNotNull(spfDataFragment);
+            Assert.IsNotNull(spfDataFragment.SpfTerms);
+            Assert.AreEqual(3, spfDataFragment.SpfTerms.Length);
+        }
     }
 }

src/Nager.EmailAuthentication/FragmentParsers/SpfRecordDataFragmentParserV1.cs

@@ -90,7 +90,7 @@ public static bool TryParse(
 
                 foreach (var mechanismType in mechanismTypes)
                 {
-                    if (!value.StartsWith(mechanismType.Key))
+                    if (!value.StartsWith(mechanismType.Key, StringComparison.OrdinalIgnoreCase))
                     {
                         continue;
                     }
@@ -120,7 +120,7 @@ public static bool TryParse(
 
                 foreach (var modifierType in modifierTypes)
                 {
-                    if (!value.StartsWith(modifierType.Key))
+                    if (!value.StartsWith(modifierType.Key, StringComparison.OrdinalIgnoreCase))
                     {
                         continue;
                     }
@@ -146,6 +146,8 @@ public static bool TryParse(
                     }
                 }
 
+                //Failure found no match
+
                 inputSpan = inputSpan[(nextIndexOfDelimiter + 1)..];
             }
 

src/Nager.EmailAuthentication/Nager.EmailAuthentication.csproj

@@ -20,7 +20,7 @@
 
     <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
 
-    <Version>4.0.0</Version>
+    <Version>4.0.1</Version>
   </PropertyGroup>
 
   <ItemGroup>