Added field to NFA, denoting if a node is lazy or not

regex/nfa.go

@@ -34,6 +34,7 @@ type nfaState struct {
 	isKleene                   bool       // Identifies whether current node is a 0-state representing Kleene star
 	isQuestion                 bool       // Identifies whether current node is a 0-state representing the question operator
 	isAlternation              bool       // Identifies whether current node is a 0-state representing an alternation
+	isLazy                     bool       // Only for split states - Identifies whether or not to flip the order of branches (try one branch before the other)
 	splitState                 *nfaState  // Only for alternation states - the 'other' branch of the alternation ('next' is the first)
 	assert                     assertType // Type of assertion of current node - NONE means that the node doesn't assert anything
 	allChars                   bool       // Whether or not the state represents all characters (eg. a 'dot' metacharacter). A 'dot' node doesn't store any contents directly, as it would take up too much space
@@ -77,6 +78,7 @@ func cloneStateHelper(stateToClone *nfaState, cloneMap map[*nfaState]*nfaState)
 		isKleene:        stateToClone.isKleene,
 		isQuestion:      stateToClone.isQuestion,
 		isAlternation:   stateToClone.isAlternation,
+		isLazy:          stateToClone.isLazy,
 		assert:          stateToClone.assert,
 		allChars:        stateToClone.allChars,
 		except:          append([]rune{}, stateToClone.except...),
@@ -421,6 +423,7 @@ func (s nfaState) equals(other nfaState) bool {
 		s.next == other.next &&
 		s.isKleene == other.isKleene &&
 		s.isQuestion == other.isQuestion &&
+		s.isLazy == other.isLazy &&
 		s.isAlternation == other.isAlternation &&
 		s.splitState == other.splitState &&
 		s.assert == other.assert &&