Cannot build the documentation with Python 3

Running Sphinx with Python 2 works fine. It fails with Python 3 with the following error:

PYTHONPATH=/<<PKGBUILDDIR>> /usr/bin/make -C docs html
make[2]: Entering directory '/<<PKGBUILDDIR>>/docs'
sphinx-build -b html -d build/doctrees   source build/html
Running Sphinx v1.5.6
making output directory...

Exception occurred:
  File "/usr/lib/python3/dist-packages/sphinx/application.py", line 512, in setup_extension
    mod = __import__(extension, None, None, ['setup'])
  File "/<<PKGBUILDDIR>>/docs/pybtex_doctools/pygments.py", line 96
    IDENTIFIER = ur'[{0}][{1}]*'.format(re.escape(NAME_CHARS), re.escape(NAME_CHARS + digits))
                               ^
SyntaxError: invalid syntax

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