Unique append to match indices (ensure match indices aren't repeated

matching.go

@@ -33,7 +33,7 @@ func findAllMatchesHelper(start *State, str string, indices []matchIndex, offset
 	if len(str) == 0 {
 		// If the start is a Kleene star, then it should also match an empty string.
 		if start.isKleene && start.isLast {
-			indices = append(indices, matchIndex{offset, offset})
+			indices, _ = unique_append(indices, matchIndex{offset, offset})
 		}
 		return indices
 	}
@@ -90,7 +90,7 @@ func findAllMatchesHelper(start *State, str string, indices []matchIndex, offset
 			for _, state := range currentStates {
 				if state.isLast {
 					endIdx = i
-					indices = append(indices, matchIndex{startIdx + offset, endIdx + offset})
+					indices, _ = unique_append(indices, matchIndex{startIdx + offset, endIdx + offset})
 				}
 			}
 			// Recursion - match with rest of string if we have nowhere to go. If we haven't moved in the string, increment the counter by 1 to ensure we don't keep trying the same string over and over
@@ -126,7 +126,7 @@ func findAllMatchesHelper(start *State, str string, indices []matchIndex, offset
 		// Only add the match if we the start index is in bounds
 		if state.isLast && startIdx+offset < len(str)+offset {
 			endIdx = i
-			indices = append(indices, matchIndex{startIdx + offset, endIdx + offset})
+			indices, _ = unique_append(indices, matchIndex{startIdx + offset, endIdx + offset})
 		}
 	}