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merge with 3.3
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@ -327,7 +327,7 @@ the second character. For example, ``\$`` matches the character ``'$'``.
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``\number``
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Matches the contents of the group of the same number. Groups are numbered
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starting from 1. For example, ``(.+) \1`` matches ``'the the'`` or ``'55 55'``,
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but not ``'the end'`` (note the space after the group). This special sequence
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but not ``'thethe'`` (note the space after the group). This special sequence
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can only be used to match one of the first 99 groups. If the first digit of
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*number* is 0, or *number* is 3 octal digits long, it will not be interpreted as
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a group match, but as the character with octal value *number*. Inside the
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