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In PCRE, following a backreference by _any_ number seems to turn it into an octal value. Why is this?
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Eg.
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`(a)\1` <-- Backreference
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`(a)\17` <-- Octal '17'
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`(a)\19` <-- Octal 1, then literal 9
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`(a)\1a` <-- Backreference, then 'a'
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