Changed API for match-finding functions - take in a Reg instead of start state and numGroups separately

matching.go

@@ -141,13 +141,14 @@ func pruneIndices(indices []Match) []Match {
 // findNthMatch finds the 'n'th match of the regex represented by the given start-state, with
 // the given string.
 // It returns an error (!= nil) if there are fewer than 'n' matches in the string.
-func findNthMatch(start *State, str []rune, numGroups int, n int) (Match, error) {
+func findNthMatch(regex Reg, str string, n int) (Match, error) {
 	idx := 0
 	matchNum := 0
+	str_runes := []rune(str)
 	var matchFound bool
 	var matchIdx Match
-	for idx <= len(str) {
-		matchFound, matchIdx, idx = findAllMatchesHelper(start, str, idx, numGroups)
+	for idx <= len(str_runes) {
+		matchFound, matchIdx, idx = findAllMatchesHelper(regex.start, str_runes, idx, regex.numGroups)
 		if matchFound {
 			matchNum++
 		}
@@ -161,13 +162,14 @@ func findNthMatch(start *State, str []rune, numGroups int, n int) (Match, error)
 
 // findAllMatches tries to find all matches of the regex represented by given start-state, with
 // the given string
-func findAllMatches(start *State, str []rune, numGroups int) []Match {
+func findAllMatches(regex Reg, str string) []Match {
 	idx := 0
+	str_runes := []rune(str)
 	var matchFound bool
 	var matchIdx Match
 	indices := make([]Match, 0)
-	for idx <= len(str) {
-		matchFound, matchIdx, idx = findAllMatchesHelper(start, str, idx, numGroups)
+	for idx <= len(str_runes) {
+		matchFound, matchIdx, idx = findAllMatchesHelper(regex.start, str_runes, idx, regex.numGroups)
 		if matchFound {
 			indices = append(indices, matchIdx)
 		}