Fix regular expression warnings on Python 3.12

Author: mnaberez

CHANGES.rst

@@ -5,6 +5,8 @@
   dropped when pasting in larger amounts of text.  This makes it possible
   to paste programs into EhBASIC and Taliforth.  Patch by SamCoVT.
 
+- Fixed regular expression warnings on Python 3.12.
+
 - The ``fill`` command in the monitor now shows an error message if an
   address or value is out of range.
 

py65/monitor.py

@@ -239,7 +239,7 @@ def _preprocess_line(self, line):
                 line = command
                 break
 
-            pattern = '^%s\s+' % re.escape(shortcut)
+            pattern = r'^%s\s+' % re.escape(shortcut)
             matches = re.match(pattern, line)
             if matches:
                 start, end = matches.span()
@@ -580,7 +580,7 @@ def do_registers(self, args):
         if args == '':
             return
 
-        pairs = re.findall('([^=,\s]*)=([^=,\s]*)', args)
+        pairs = re.findall(r'([^=,\s]*)=([^=,\s]*)', args)
         if pairs == []:
             return self._output("Syntax error: %s" % args)
 

py65/utils/addressing.py

@@ -61,7 +61,7 @@ def number(self, num):
                 return self.labels[num]
 
             else:
-                matches = re.match('^([^\s+-]+)\s*([+\-])\s*([$+%]?\d+)$', num)
+                matches = re.match(r'^([^\s+-]+)\s*([+\-])\s*([$+%]?\d+)$', num)
                 if matches:
                     label, sign, offset = matches.groups()
 
@@ -88,7 +88,7 @@ def range(self, addresses):
         """Parse a string containing an address or a range of addresses
         into a tuple of (start address, end address)
         """
-        matches = re.match('^([^:,]+)\s*[:,]+\s*([^:,]+)$', addresses)
+        matches = re.match(r'^([^:,]+)\s*[:,]+\s*([^:,]+)$', addresses)
         if matches:
             start, end = map(self.number, matches.groups(0))
         else: