tools/check_board_header.py et al give SyntaxWarnings for invalid escape sequences

[dhalbert]

tools/check_board_header.py gives syntax warnings for invalid escape sequences when used with Python 3.12 (at least). The re strings should be raw strings.

example:

/home/halbert/repos/adafruit/pico-sdk/tools/check_board_header.py:223: SyntaxWarning: invalid escape sequence '\s'
  if re.match("^\s*// For board detection", line):
/home/halbert/repos/adafruit/pico-sdk/tools/check_board_header.py:228: SyntaxWarning: invalid escape sequence '\s'
  m = re.match("^\s*// This header may be included by other board headers as \"(.+?)\"", line)

I'll submit a PR for this shortly

[lurch]

This might have already been fixed in #2519 ?
(jumping in early to save you potentially duplicating effort 🙂 )

[dhalbert]

Hmm, I searched for mentions of check_board_header.py, but somehow that PR didn't come up. I fixed more places than #2519 addressed, I believe. Maybe merge my #2530 first, and then #2519 should be mergeable, I think without conflicts.

[lurch]

pinging @will-v-pi because he'll be better placed to determine in which order the PRs should be merged!