ci: Mark the regex to find chunks in code style checks as regex string
Fixes
check-style.py:23: SyntaxWarning: invalid escape sequence '\+'
check-style.py:24: SyntaxWarning: invalid escape sequence '\d'
Edited by Peter Hutterer
Fixes
check-style.py:23: SyntaxWarning: invalid escape sequence '\+'
check-style.py:24: SyntaxWarning: invalid escape sequence '\d'