Replaced call to 'FindAllMatches' with call to 'FindAll' or 'FindAllSubmatch' depending on whether I need submatches

regex/nfa.go

@@ -156,17 +156,18 @@ func (s nfaState) checkAssertion(str []rune, idx int) bool {
 			strToMatch = string(runesToMatch)
 		}
 
-		matchIndices := FindAllMatches(Reg{startState, s.lookaroundNumCaptureGroups}, strToMatch)
+		regComp := Reg{startState, s.lookaroundNumCaptureGroups}
+		matchIndices := regComp.FindAll(strToMatch)
 
 		numMatchesFound := 0
 		for _, matchIdx := range matchIndices {
 			if s.assert == plaAssert || s.assert == nlaAssert { // Lookahead - return true (or false) if at least one match starts at 0. Zero is used because the test-string _starts_ from idx.
-				if matchIdx[0].StartIdx == 0 {
+				if matchIdx.StartIdx == 0 {
 					numMatchesFound++
 				}
 			}
 			if s.assert == plbAssert || s.assert == nlbAssert { // Lookbehind - return true (or false) if at least one match _ends_ at the current index.
-				if matchIdx[0].EndIdx == idx {
+				if matchIdx.EndIdx == idx {
 					numMatchesFound++
 				}
 			}