diff --git a/ProfanityFilter.Tests.Unit/ProfanityTests.cs b/ProfanityFilter.Tests.Unit/ProfanityTests.cs
index 33c48f2..04c5bba 100644
--- a/ProfanityFilter.Tests.Unit/ProfanityTests.cs
+++ b/ProfanityFilter.Tests.Unit/ProfanityTests.cs
@@ -898,5 +898,14 @@ public void ContainsProfanityReturnsTrueWhenProfanityIsADollarDollar()
 
             Assert.IsTrue(result);
         }
+
+        [TestMethod]
+        public void ContainsProfanityReturnsTrueWhenProfanityIsVariableCase()
+        {
+            var filter = new ProfanityFilter();
+            var result = filter.ContainsProfanity("Fuck");
+
+            Assert.IsTrue(result);
+        }
     }
 }
\ No newline at end of file
diff --git a/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs b/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
index 3af0bc6..1385e15 100644
--- a/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
+++ b/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
@@ -272,9 +272,9 @@ public bool ContainsProfanity(string term)
                 return false;
             }
 
-            Regex regex = new Regex(string.Format(@"(?:{0})", string.Join("|", potentialProfanities).Replace("$", "\\$"), RegexOptions.IgnoreCase));
+            string regexPattern = string.Format(@"(?:{0})", string.Join("|", potentialProfanities).Replace("$", "\\$"));
 
-            foreach (Match profanity in regex.Matches(term))
+            foreach (Match profanity in Regex.Matches(term, regexPattern, RegexOptions.IgnoreCase))
             {
                 // if any matches are found and aren't in the allowed list, we can return true here without checking further
                 if (!AllowList.Contains(profanity.Value.ToLower(CultureInfo.InvariantCulture)))