Fix regexp string quoting

[dov]

Fix regexp string quoting that cause warnings during cmake

[wwmayer]

Which warnings do you get?

[dov]

Here's the error during cmake:

[1/1505] Generating version_check
/space3/pub-repos/FreeCAD/src/Tools/SubWCRev.py:269: SyntaxWarning: invalid escape sequence '\.'
  match = re.match("git@github\.com:(\S+?)/(\S+\.git)", url) or re.match(
/space3/pub-repos/FreeCAD/src/Tools/SubWCRev.py:270: SyntaxWarning: invalid escape sequence '\.'
  "https://github\.com/(\S+)/(\S+\.git)", url
/space3/pub-repos/FreeCAD/src/Tools/SubWCRev.py:274: SyntaxWarning: invalid escape sequence '\S'
  match = re.match("ssh://\S+?@(\S+)", url)
/space3/pub-repos/FreeCAD/src/Tools/SubWCRev.py:372: SyntaxWarning: invalid escape sequence '\*'
  if re.match("\*", self.branch) is not None:
git
/space3/pub-repos/FreeCAD/build/src/Build/Version.h.out written

It's a simple raw string python error. You can reproduce it by doing:

python
>>> '\s+'   # This is an error
<stdin>:1: SyntaxWarning: invalid escape sequence '\s'
'\\s+'
>>> r'\s+'   # This is ok!
'\\s+'

See e.g.: https://realpython.com/python-raw-strings/

[wwmayer]

Thanks. It seems it 's deprecated since Py3.11 or 3.12 because with Py3.10 I don't get this warning.

[dov]

@wwmayer

It's actually always been invalid code. How else would you distinguish between '\n' and '\n' if the former was written? However the warnings indeed to be new. See:

https://adamj.eu/tech/2022/11/04/why-does-python-deprecationwarning-invalid-escape-sequence/

In an case, thanks for merging! Perhaps it will prompt me to submit something more substantial one day.