fix: invalid escape sequence

[olemoign]

Normal strings regex produce "SyntaxWarning: invalid escape sequence" for special chars like "&", "\d" and "\S".
Transform those normal strings to raw strings to fix this.

[svituz]

Hi,
I'm not sure I'm getting the problem you're trying to solve.
Can you provide a snippet that replicates the bug?

[olemoign]

Hi,
this is not a huge problem as those are warnings only, so I expect the regex to still work.
I think those warnings appeared with python 3.12, as I don't remember seeing them before.
I don't know if they appear again during a call to the respective functions, I see them during the start of my app, which imports hl7apy, so this happens during the parsing of the python code.

[olemoign]

The logs:

/usr/local/lib/python3.12/site-packages/hl7apy/exceptions.py:45: SyntaxWarning: invalid escape sequence '&'
"""
/usr/local/lib/python3.12/site-packages/hl7apy/parser.py:40: SyntaxWarning: invalid escape sequence '&'
"""
/usr/local/lib/python3.12/site-packages/hl7apy/parser.py:637: SyntaxWarning: invalid escape sequence '\S'
m = re.match("^MSH(?P<field_sep>\S)", content)
/usr/local/lib/python3.12/site-packages/hl7apy/core.py:117: SyntaxWarning: invalid escape sequence '\d'
regex = '^z[a-z1-9]{2}_\d+$'
/usr/local/lib/python3.12/site-packages/hl7apy/utils.py:116: SyntaxWarning: invalid escape sequence '\d'
offset = re.search('\d*((+(1[0-4]|0[0-9])|(-(1[0-2]|0[0-9])))([0-5][0-9]))$', value)

[olemoign]

I think the first two logs are linked to DEFAULT_ENCODING_CHARS but I couldn't test it.

[svituz]

thanks