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Matching REx "(?:(.)b|.)+" against "abc"
   0 <> <abc>                |  1:CURLYX[0] {1,32767}(15)
   0 <> <abc>                | 14:  WHILEM[1/1](0)
...
   0 <> <abc>                |  4:      OPEN1(6)
   0 <> <abc>                |  6:      REG_ANY(7)
   1 <a> <bc>                |  7:      CLOSE1(9)

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   1 <a> <bc>                |  9:      EXACTF <b>(14)
   2 <ab> <c>                | 14:      WHILEM[1/1](0)
...
   2 <ab> <c>                |  4:          OPEN1(6)
   2 <ab> <c>                |  6:          REG_ANY(7)
   3 <abc> <>                |  7:          CLOSE1(9)

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   3 <abc> <>                |  9:          EXACTF <b>(14)
                                            failed...
   2 <ab> <c>                | 11:        BRANCH(13)

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   2 <ab> <c>                | 12:          REG_ANY(14)
   3 <abc> <>                | 14:          WHILEM[1/1](0)
...
   3 <abc> <>                | 16:            END(0)
Match successful!
Test:             $1='c', $2=''

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Matching REx "(?:(.)b|.)+" against "ac"
   0 <> <ac>                 |  1:CURLYX[0] {1,32767}(15)
...
   0 <> <ac>                 |  4:      OPEN1(6)
   0 <> <ac>                 |  6:      REG_ANY(7)
   1 <a> <c>                 |  7:      CLOSE1(9)

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   1 <a> <c>                 |  9:      EXACTF <b>(14)
                                        failed...
   0 <> <ac>                 | 11:    BRANCH(13)

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   0 <> <ac>                 | 12:      REG_ANY(14)
   1 <a> <c>                 | 14:      WHILEM[1/1](0)
...
   2 <ac> <>                 | 16:            END(0)
Match successful!
Test:             $1='', $2=''