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