[3.12] gh-83162: Rename re.error in idlelib (GH-101677) (#112987)

Backport idlelib part of #101677 with simple rename.

Author: terryjreedy

Lib/idlelib/replace.py

@@ -4,6 +4,7 @@
 and replace+find.
 """
 import re
+re.PatternError = re.error  # New in 3.13.
 
 from tkinter import StringVar, TclError
 
@@ -120,7 +121,7 @@ def _replace_expand(self, m, repl):
         if self.engine.isre():
             try:
                 new = m.expand(repl)
-            except re.error:
+            except re.PatternError:
                 self.engine.report_error(repl, 'Invalid Replace Expression')
                 new = None
         else:

Lib/idlelib/searchengine.py

@@ -1,5 +1,6 @@
 '''Define SearchEngine for search dialogs.'''
 import re
+re.PatternError = re.error  # New in 3.13.
 
 from tkinter import StringVar, BooleanVar, TclError
 from tkinter import messagebox
@@ -84,7 +85,7 @@ def getprog(self):
             flags = flags | re.IGNORECASE
         try:
             prog = re.compile(pat, flags)
-        except re.error as e:
+        except re.PatternError as e:
             self.report_error(pat, e.msg, e.pos)
             return None
         return prog