Python warning: lyx_pot.py:607: SyntaxWarning: invalid escape sequence '\w'

[Scott Kostyshak]

I see several warnings on a newer system (with Python 3.12.3) along the
following lines:

[  7%] /usr/bin/python3 /home/scott/lyxbuilds/master-master/repo/po/lyx_pot.py -b /home/scott/lyxbuilds/master-master/repo -o  /home/scott/lyxbuilds/master-master/CMakeBuild/po/examples_templates_l10n.pot -t examples_templates --src_file=/home/scott/lyxbuilds/master-master/CMakeBuild/po/examples_templates_files
cd /home/scott/lyxbuilds/master-master/CMakeBuild/po && /usr/bin/python3 /home/scott/lyxbuilds/master-master/repo/po/lyx_pot.py -b /home/scott/lyxbuilds/master-master/repo -o /home/scott/lyxbuilds/master-master/CMakeBuild/po/examples_templates_l10n.pot -t examples_templates --src_file=/home/scott/lyxbuilds/master-master/CMakeBuild/po/examples_templates_files
/home/scott/lyxbuilds/master-master/repo/po/lyx_pot.py:607: SyntaxWarning: invalid escape sequence '\w'
  reg = re.compile('Encoding [\w-]+\s+[\w-]+\s+"([\w \-\(\)\[\]\/^"]*)"\s+["\w-]+\s+(fixed|variable|variableunsafe)\s+\w+.*')

In the attached patch, I just put a 'r' in front of the string inside
re.compile(). It seems to make Python happy. Is it OK to commit?

Scott
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