Add a note about the regex library calibre uses

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Kovid Goyal 2020-06-21 14:00:41 +05:30
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@ -144,5 +144,7 @@ Thanks for helping with tips, corrections and such:
* Starson17 * Starson17
* Orpheu * Orpheu
For more about regexps see `The Python User Manual <https://docs.python.org/2/library/re.html>`_. For more about regexps see `The Python User Manual <https://docs.python.org/3/library/re.html>`_.
The actual regular expression library used by calibre is:
`regex <https://bitbucket.org/mrabarnett/mrab-regex/src/hg/>`_ which supports
several useful enhancements over the python standard library one.