sheeeng
diff --git a/‎Lib/re/_compiler.py‎
Lines changed: 3 additions & 0 deletions b/‎Lib/re/_compiler.py‎
Lines changed: 3 additions & 0 deletions
diff --git a/‎Lib/re/_constants.py‎
Lines changed: 3 additions & 1 deletion b/‎Lib/re/_constants.py‎
Lines changed: 3 additions & 1 deletion
diff --git a/‎Lib/re/_parser.py‎
Lines changed: 3 additions & 4 deletions b/‎Lib/re/_parser.py‎
Lines changed: 3 additions & 4 deletions
@@ -101,6 +101,8 @@ def _compile(code, pattern, flags):
             else:
                 emit(ANY)
         elif op in REPEATING_CODES:
+            if flags & SRE_FLAG_TEMPLATE:
+                raise error("internal: unsupported template operator %r" % (op,))
             if _simple(av[2]):
                 emit(REPEATING_CODES[op][2])
                 skip = _len(code); emit(0)
@@ -761,3 +763,4 @@ def compile(p, flags=0):
         p.state.groups-1,
         groupindex, tuple(indexgroup)
         )
+
@@ -13,7 +13,7 @@
 
 # update when constants are added or removed
 
-MAGIC = 20230612
+MAGIC = 20221023
 
 from _sre import MAXREPEAT, MAXGROUPS
 
@@ -204,6 +204,7 @@ def _makecodes(*names):
 }
 
 # flags
+SRE_FLAG_TEMPLATE = 1 # template mode (unknown purpose, deprecated)
 SRE_FLAG_IGNORECASE = 2 # case insensitive
 SRE_FLAG_LOCALE = 4 # honour system locale
 SRE_FLAG_MULTILINE = 8 # treat target as multiline string
@@ -217,3 +218,4 @@ def _makecodes(*names):
 SRE_INFO_PREFIX = 1 # has prefix
 SRE_INFO_LITERAL = 2 # entire pattern is literal (given by prefix)
 SRE_INFO_CHARSET = 4 # pattern starts with character from given set
+RE_INFO_CHARSET = 4 # pattern starts with character from given set
@@ -61,11 +61,12 @@
     "x": SRE_FLAG_VERBOSE,
     # extensions
     "a": SRE_FLAG_ASCII,
+    "t": SRE_FLAG_TEMPLATE,
     "u": SRE_FLAG_UNICODE,
 }
 
 TYPE_FLAGS = SRE_FLAG_ASCII | SRE_FLAG_LOCALE | SRE_FLAG_UNICODE
-GLOBAL_FLAGS = SRE_FLAG_DEBUG
+GLOBAL_FLAGS = SRE_FLAG_DEBUG | SRE_FLAG_TEMPLATE
 
 # Maximal value returned by SubPattern.getwidth().
 # Must be larger than MAXREPEAT, MAXCODE and sys.maxsize.
@@ -780,10 +781,8 @@ def _parse(source, state, verbose, nested, first=False):
                                            source.tell() - start)
                     if char == "=":
                         subpatternappend((ASSERT, (dir, p)))
-                    elif p:
-                        subpatternappend((ASSERT_NOT, (dir, p)))
                     else:
-                        subpatternappend((FAILURE, ()))
+                        subpatternappend((ASSERT_NOT, (dir, p)))
                     continue
 
                 elif char == "(":