Minor refactoring

src/algo.go

@@ -90,7 +90,7 @@ func ExactMatchNaive(caseSensitive bool, input *string, pattern []rune) (int, in
 	runes := []rune(*input)
 	numRunes := len(runes)
 	plen := len(pattern)
-	if len(runes) < plen {
+	if numRunes < plen {
 		return -1, -1
 	}
 

src/tokenizer.go

@@ -118,14 +118,13 @@ func awkTokenizer(input *string) ([]string, int) {
 }
 
 func Tokenize(str *string, delimiter *regexp.Regexp) []Token {
-	prefixLength := 0
 	if delimiter == nil {
 		// AWK-style (\S+\s*)
 		tokens, prefixLength := awkTokenizer(str)
 		return withPrefixLengths(tokens, prefixLength)
 	} else {
 		tokens := delimiter.FindAllString(*str, -1)
-		return withPrefixLengths(tokens, prefixLength)
+		return withPrefixLengths(tokens, 0)
 	}
 }