diff --git a/re_test.go b/re_test.go
index bd54de4..3f0d09e 100644
--- a/re_test.go
+++ b/re_test.go
@@ -309,6 +309,10 @@ var reTests = []struct {
 	{`\0009`, nil, "\x009", []Group{{0, 2}}},
 	{`\141`, nil, "a", []Group{{0, 1}}},
 
+	// At this point, the python test suite has a bunch
+	// of backreference tests. Since my engine doesn't
+	// implement backreferences, I've skipped those tests.
+
 	{`*a`, nil, ``, nil},
 	{`(*)b`, nil, ``, nil},
 	{`a**`, nil, ``, nil},
@@ -318,10 +322,6 @@ var reTests = []struct {
 	{`a[b-]`, nil, `a-`, []Group{{0, 2}}},
 	{`a[b-a]`, nil, `a-`, nil},
 
-	// At this point, the python test suite has a bunch
-	// of backreference tests. Since my engine doesn't
-	// implement backreferences, I've skipped those tests.
-
 	// Todo - add numeric range tests
 }
 
@@ -427,6 +427,27 @@ func TestFindAllMatches(t *testing.T) {
 			}
 		})
 	}
+	fmt.Printf("----------------CASE INSENSITIVE MATCHING----------------")
+	// Case-insensitive run, with test string case-swapped
+	for _, test := range reTests {
+		t.Run(test.re+"	"+swapCase(test.str), func(t *testing.T) {
+			regComp, err := Compile(test.re, append(test.flags, RE_CASE_INSENSITIVE)...)
+			if err != nil {
+				if test.result != nil {
+					panic(fmt.Errorf("Test Error: %v", err))
+				}
+			} else {
+				matchIndices := FindAllMatches(regComp, swapCase(test.str))
+				zeroGroups := make([]Group, len(matchIndices))
+				for i, m := range matchIndices {
+					zeroGroups[i] = m[0]
+				}
+				if !slices.Equal(test.result, zeroGroups) {
+					t.Errorf("Wanted %v	Got %v\n", test.result, zeroGroups)
+				}
+			}
+		})
+	}
 }
 
 func TestFindString(t *testing.T) {
@@ -452,6 +473,30 @@ func TestFindString(t *testing.T) {
 			}
 		})
 	}
+	fmt.Printf("----------------CASE INSENSITIVE MATCHING----------------")
+	// Case-insensitive run, with test string case-swapped
+	for _, test := range reTests {
+		t.Run(test.re+"	"+swapCase(test.str), func(t *testing.T) {
+			regComp, err := Compile(test.re, append(test.flags, RE_CASE_INSENSITIVE)...)
+			if err != nil {
+				if test.result != nil {
+					panic(err)
+				}
+			} else {
+				foundString := FindString(regComp, swapCase(test.str))
+				if len(test.result) == 0 {
+					if foundString != "" {
+						t.Errorf("Expected no match got %v\n", foundString)
+					}
+				} else {
+					expectedString := test.str[test.result[0].startIdx:test.result[0].endIdx]
+					if foundString != expectedString {
+						t.Errorf("Wanted %v	Got %v\n", expectedString, foundString)
+					}
+				}
+			}
+		})
+	}
 }
 
 func TestFindAllGroups(t *testing.T) {
@@ -475,4 +520,26 @@ func TestFindAllGroups(t *testing.T) {
 			}
 		})
 	}
+	fmt.Printf("----------------CASE INSENSITIVE MATCHING----------------")
+	// Case-insensitive run, with test string case-swapped
+	for _, test := range groupTests {
+		t.Run(test.re+"	"+swapCase(test.str), func(t *testing.T) {
+			regComp, err := Compile(test.re, append(test.flags, RE_CASE_INSENSITIVE)...)
+			if err != nil {
+				if test.result != nil {
+					panic(err)
+				}
+			}
+			matchIndices := FindAllMatches(regComp, swapCase(test.str))
+			for i := range matchIndices {
+				for j := range matchIndices[i] {
+					if matchIndices[i][j].isValid() {
+						if test.result[i][j] != matchIndices[i][j] {
+							t.Errorf("Wanted %v	Got %v\n", test.result, matchIndices)
+						}
+					}
+				}
+			}
+		})
+	}
 }