Started working on '+' operator

main.go

@@ -11,7 +11,7 @@ import (
 const CONCAT rune = '~'
 
 func isOperator(c rune) bool {
-	if c == '*' || c == '|' || c == CONCAT {
+	if c == '+' || c == '*' || c == '|' || c == CONCAT {
 		return true
 	}
 	return false
@@ -19,7 +19,7 @@ func isOperator(c rune) bool {
 
 /* priority returns the priority of the given operator */
 func priority(op rune) int {
-	precedence := []rune{'|', CONCAT, '*'}
+	precedence := []rune{'|', CONCAT, '+', '*'}
 	return slices.Index(precedence, op)
 }
 
@@ -138,6 +138,8 @@ func thompson(re string) *State {
 			}
 			stateToAdd.transitions[s1.content] = append(stateToAdd.transitions[s1.content], s1)
 			nfa = append(nfa, stateToAdd)
+		case '+':
+
 		case '|':
 			s1 := pop(&nfa)
 			s2 := pop(&nfa)