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libxml2
1: Regexp: (a|b{0,3}){0,1}
2: a: Ok
3: aa: Fail
4: b: Ok
5: bb: Ok
6: bbb: Ok
7: bbbb: Fail
8: ab: Fail
9: ba: Fail
10: Regexp: ([0-9]{0,3}|([0-9]{0}|[0-9]{0,3})){0,3}
11: 0: Ok
12: 00: Ok
13: 123: Ok
14: abc: Fail