[docs] [issue12162] Documentation about re \number

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

The regex sets (\d\w\s\D\W\S) don't match any Python escape sequence, so even if some suggest to always use r'' regardless, I don't find it necessary, especially for simple regexs.
The two conflicting escape sequences to keep in mind are \b (backspace for Python, word boundary for re) and \number (octal escape for Python, reference to a group for re).
There are also other regex escape sequences that are rarely used (\B\A\Z), but these don't need to be escaped either.

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