Fixed boneheaded mistake with checking assertion types

nfa.go

@@ -33,14 +33,12 @@ func (s State) contentContains(str []rune, idx int) bool {
 	if s.assert == EOS {
 		return idx == len(str)
 	}
-	if s.assert == WBOUND {
 	if s.assert == WBOUND {
 		return isWordBoundary(str, idx)
 	}
 	if s.assert == NONWBOUND {
 		return !isWordBoundary(str, idx)
 	}
-	}
 	// Default - s.assert must be NONE
 	return slices.Contains(s.content, int(str[idx]))
 }