regex ir opt code on rewrite

future/ngra-regex-ir.md

@@ -55,10 +55,14 @@ FIND_SEQ(a, first)
 MATCH_SEQ(a)
 COUNT_SEQ(a,0,+inf,greedy)
 
+完成
+
 3. a{1} -> a
 
 4. .\*a\*特征，优化为.*
 
+完成，最优先
+
 5. a{m,n}特征，展开为
 MATCH_SEQ(aa...m个a....aa)
 COUNT_SEQ(a,0,n,greedy)