I suppose the idea was to remove the empty else clause together with the debugging prints...  Anyhow, when doing so, i.e. with this test 

  if(/
      (?(?=(.*o){1})
        (?(?!(.*r){1})
          (?=(.*w){2})
        )
      |
        (?=(.*w){2})
        (?=(.*r){1})
    )
    ^..W$
  /xi)

[download]

I can confirm that 5.8.8 and 5.10.0 are in fact producing different results: 5.8.8 gives YES/NO/NO/NO/YES/NO/NO/YES, while with 5.10.0 everything matches.

In reply to Re^2: Oddity with Conditional Regex by almut
in thread Oddity with Conditional Regex by Rabscuttle

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