[docs] [issue10875] Update Regular Expression HOWTO

[SilentGhost]

SilentGhost <ghost.adh at gmail.com> added the comment:

It seems that the special sequences description in Matching Characters section need to be updated to incorporate information on unicode and bytes. I don't think, however, that it's a good idea just to copy that information from the Doc/library/re.rst May be the section could be shortened and linked to that RE Syntax section? there aren't any deeper links available unfortunately.

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