concat
2
-1
repitition
2
18
26
-1
-1
-1
alternation
1
1
1
1
1
-1
perens!
1
1
2
2
2
12
0
optional!
-1
1
2
escape!
-1
2
3
Old Contributed
1
2
4
0
2
4
-1
1
5
0
6
9