Use raw strings for regular expressions with invalid escape sequences

If "T(\d*)" was "T(\n*)" it would search for newlines.  There isn't
any such \d escape character.

It should be "T(\\d*)" or r"T(\d*)" going with the latter, to be
easier to read and be consistent with other Cura usage.

Start python with -Wd or for python 3.12 will raise a SyntaxWarning.

plugins/PostProcessingPlugin/Script.py

@@ -122,7 +122,7 @@ class Script:
         if not key in line or (';' in line and line.find(key) > line.find(';')):
             return default
         sub_part = line[line.find(key) + 1:]
-        m = re.search('^-?[0-9]+\.?[0-9]*', sub_part)
+        m = re.search(r'^-?[0-9]+\.?[0-9]*', sub_part)
         if m is None:
             return default
         try:

plugins/PostProcessingPlugin/scripts/PauseAtHeight.py

@@ -338,7 +338,7 @@ class PauseAtHeight(Script):
                     nbr_negative_layers += 1
 
                 #Track the latest printing temperature in order to resume at the correct temperature.
-                if re.match("T(\d*)", line):
+                if re.match(r"T(\d*)", line):
                     current_t = self.getValue(line, "T")
                 m = self.getValue(line, "M")
                 if m is not None and (m == 104 or m == 109) and self.getValue(line, "S") is not None:

plugins/UM3NetworkPrinting/src/ExportFileJob.py

@@ -28,7 +28,7 @@ class ExportFileJob(WriteFileJob):
 
         # Determine the filename.
         job_name = CuraApplication.getInstance().getPrintInformation().jobName
-        job_name = re.sub("[^\w\-. ()]", "-", job_name)
+        job_name = re.sub(r"[^\w\-. ()]", "-", job_name)
         extension = self._mesh_format_handler.preferred_format.get("extension", "")
         self.setFileName("{}.{}".format(job_name, extension))
 

scripts/extract_changelog.py

@@ -13,7 +13,7 @@ if __name__ == "__main__":
         args.version = args.version[:-2]
 
     start_token = f"[{args.version}]"
-    pattern_stop_log = "\[\d+(\.\d+){1,2}\]"
+    pattern_stop_log = r"\[\d+(\.\d+){1,2}\]"
     log_line = False
     first_chapter = True