[issue10875] Update Regular Expression HOWTO

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Since I think I know how to do it, easily, I will try to derive the 2.7 patch.

In Matching Characters, I think
"The following predefined special sequences are available:"

should be expanded to 

"The following predefined special sequences are a subset of those available. The equivalent classes are for bytes patterns. For a complete list of sequences and expanded class definitions for Unicode string patterns, see the end of Regular Expression Syntax."
(with section reference markup).

Note to myself. /bytes/byte string/ for 2.7.

While the changes all look innocuous to me with respect to building the docs, I am curious if you have tried to rebuild the HOWTO (if you have the tool chain, which I do not).

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