Convert test_str into a rune slice for better unicode compatibility, it also fixed the bug where all unicode characters wouldn't be colored

cmd/main.go

@@ -129,6 +129,8 @@ func main() {
 			matchIndices = regComp.FindAllSubmatch(test_str)
 		}
 
+		test_str_runes := []rune(test_str) // Converting to runes preserves unicode characters
+
 		if *printMatchesFlag {
 			// if we are in single line mode, print the line on which
 			// the matches occur
@@ -158,10 +160,10 @@ func main() {
 			oldIndices := indicesToPrint.values()
 			indicesToPrint = new_uniq_arr[int]()
 			// Explanation:
-			// Find all numbers from 0 to len(test_str) that are NOT in oldIndices.
+			// Find all numbers from 0 to len(test_str_runes) that are NOT in oldIndices.
 			// These are the values we want to print, now that we have inverted the match.
 			// Re-initialize indicesToPrint and add all of these values to it.
-			indicesToPrint.add(setDifference(genRange(0, len(test_str)), oldIndices)...)
+			indicesToPrint.add(setDifference(genRange(0, len(test_str_runes)), oldIndices)...)
 
 		}
 		// If lineFlag is enabled, we should only print something if:
@@ -182,7 +184,7 @@ func main() {
 		//			the corresponding end index.
 		// 		3. If not, just print the character.
 		if substituteFlagEnabled {
-			for i := range test_str {
+			for i := range test_str_runes {
 				inMatchIndex := false
 				for _, m := range matchIndices {
 					if i == m[0].StartIdx {
@@ -193,11 +195,11 @@ func main() {
 					}
 				}
 				if !inMatchIndex {
-					fmt.Fprintf(out, "%c", test_str[i])
+					fmt.Fprintf(out, "%c", test_str_runes[i])
 				}
 			}
 		} else {
-			for i, c := range test_str {
+			for i, c := range test_str_runes {
 				if indicesToPrint.contains(i) {
 					color.New(color.FgRed).Fprintf(out, "%c", c)
 					// Newline after every match - only if -o is enabled and -v is disabled.