Apply ruff rule RUF039

RUF039 First argument to `re.match()` is not raw string
RUF039 First argument to `re.search()` is not raw string
RUF039 First argument to `re.compile()` is not raw string

util/authors.py

@@ -49,7 +49,7 @@ def analyze_line(line, names, disp=False):
         line = line.strip().decode('utf-8')
 
         # Check the commit author name
-        m = re.match('^@@@([^@]*)@@@', line)
+        m = re.match(r'^@@@([^@]*)@@@', line)
         if m:
             name = m.group(1)
             line = line[m.end():]
@@ -84,7 +84,7 @@ def analyze_line(line, names, disp=False):
 
     # Sort
     def name_key(fullname):
-        m = re.search(' [a-z ]*[A-Za-z-]+$', fullname)
+        m = re.search(r' [a-z ]*[A-Za-z-]+$', fullname)
         if m:
             forename = fullname[:m.start()].strip()
             surname = fullname[m.start():].strip()

util/gh_lists.py

@@ -89,7 +89,7 @@ def get_issues(getter, project, milestone):
         raw_datas.append(raw_data)
         if 'link' not in info:
             break
-        m = re.search('<(.*?)>; rel="next"', info['link'])
+        m = re.search(r'<(.*?)>; rel="next"', info['link'])
         if m:
             url = m.group(1)
             continue

util/refguide_check.py

@@ -346,7 +346,7 @@ def check_rest(module, names, dots=True):
                                 traceback.format_exc()))
                 continue
 
-        m = re.search("([\x00-\x09\x0b-\x1f])", text)
+        m = re.search(r"([\x00-\x09\x0b-\x1f])", text)
         if m:
             msg = ("Docstring contains a non-printable character %r! "
                    "Maybe forgot r\"\"\"?" % (m.group(1),))
@@ -429,7 +429,7 @@ def report_failure(self, out, test, example, got):
                                                     example, got)
 
 class Checker(doctest.OutputChecker):
-    obj_pattern = re.compile('at 0x[0-9a-fA-F]+>')
+    obj_pattern = re.compile(r'at 0x[0-9a-fA-F]+>')
     vanilla = doctest.OutputChecker()
     rndm_markers = {'# random', '# Random', '#random', '#Random', "# may vary"}
     stopwords = {'plt.', '.hist', '.show', '.ylim', '.subplot(',