0 <> <ac>                 | 12:      REG_ANY(14)
   1 <a> <c>                 | 14:      WHILEM[1/1](0)
                                        whilem: matched 1 out of 1..32767
   1 <a> <c>                 |  3:        BRANCH(11)
   1 <a> <c>                 |  4:          OPEN1(6)
   1 <a> <c>                 |  6:          REG_ANY(7)
   2 <ac> <>                 |  7:          CLOSE1(9)
   2 <ac> <>                 |  9:          EXACTF <b>(14)
                                            failed...
   1 <a> <c>                 | 11:        BRANCH(13)
   1 <a> <c>                 | 12:          REG_ANY(14)
   2 <ac> <>                 | 14:          WHILEM[1/1](0)
                                            whilem: matched 2 out of 1..32767
   2 <ac> <>                 |  3:            BRANCH(11)
   2 <ac> <>                 |  4:              OPEN1(6)
   2 <ac> <>                 |  6:              REG_ANY(7)
                                                failed...
   2 <ac> <>                 | 11:            BRANCH(13)
   2 <ac> <>                 | 12:              REG_ANY(14)
                                                failed...
                                              BRANCH failed...
                                            whilem: failed, trying continuation.
..
   2 <ac> <>                 | 15:            NOTHING(16)
   2 <ac> <>                 | 16:            END(0)
Match successful!
Test:             $1='', $2=''