Use raw strings when using \.

The sequence `\.` is an undefined escape sequence, but can be found in regex-strings. In regex strings, we usually want the backslash character and the dot character, instead of escaping dot like if it was a tab character `\t`. This is what raw strings (strings prefixed with r) do: they treat backslashes as literal characters.

In Python 3.12, using `\.` in a string (not raw strings) raises `SyntaxWarning: invalid escape sequence '\.'`

gui/wxpython/core/globalvar.py

@@ -257,8 +257,8 @@ def UpdateGRASSAddOnCommands(eList=None):
 os.environ["PATH"] = os.path.join(GUIDIR, "scripts") + os.pathsep + os.environ["PATH"]
 
 ignoredCmdPattern = (
-    "^d\..*|^r[3]?\.mapcalc$|^i.group$|^r.import$|"
-    "^r.external$|^r.external.out$|"
-    "^v.import$|^v.external$|^v.external.out$|"
-    "^cd$|^cd .*"
+    r"^d\..*|^r[3]?\.mapcalc$|^i.group$|^r.import$|"
+    r"^r.external$|^r.external.out$|"
+    r"^v.import$|^v.external$|^v.external.out$|"
+    r"^cd$|^cd .*"
 )

gui/wxpython/lmgr/frame.py

@@ -947,9 +947,9 @@ def _switchPage(self, notification):
 
     def RunSpecialCmd(self, command):
         """Run command from command line, check for GUI wrappers"""
-        if re.compile("^d\..*").search(command[0]):
+        if re.compile(r"^d\..*").search(command[0]):
             self.RunDisplayCmd(command)
-        elif re.compile("r[3]?\.mapcalc").search(command[0]):
+        elif re.compile(r"r[3]?\.mapcalc").search(command[0]):
             self.OnMapCalculator(event=None, cmd=command)
         elif command[0] == "i.group":
             self.OnEditImageryGroups(event=None, cmd=command)

lib/init/grass.py

@@ -280,7 +280,7 @@ def f(fmt, *args):
     matches = []
     # https://docs.python.org/3/library/stdtypes.html#old-string-formatting
     for m in re.finditer(
-        "%([#0 +-]*)([0-9]*)(\.[0-9]*)?([hlL]?[diouxXeEfFgGcrsa%])", fmt
+        r"%([#0 +-]*)([0-9]*)(\.[0-9]*)?([hlL]?[diouxXeEfFgGcrsa%])", fmt
     ):
         matches.append(m)