Fix re brain on 3.11

Author: DanielNoord

ChangeLog

@@ -6,7 +6,7 @@ What's New in astroid 2.12.0?
 =============================
 Release date: TBA
 
-
+* Fix ``re`` brain on Python ``3.11``. The flags now come from ``re._compile``.
 
 What's New in astroid 2.11.3?
 =============================

astroid/brain/brain_re.py

@@ -7,33 +7,39 @@
 from astroid import context, inference_tip, nodes
 from astroid.brain.helpers import register_module_extender
 from astroid.builder import _extract_single_node, parse
-from astroid.const import PY37_PLUS, PY39_PLUS
+from astroid.const import PY37_PLUS, PY39_PLUS, PY311_PLUS
 from astroid.manager import AstroidManager
 
 
-def _re_transform():
-    # Since Python 3.6 there is the RegexFlag enum
-    # where every entry will be exposed via updating globals()
+def _re_transform() -> nodes.Module:
+    # The RegexFlag enum exposes all its entries by updating globals()
+    # On 3.11+ all flags come from re._compiler
+    if PY311_PLUS:
+        import_compiler = "import re._compiler as _compiler"
+    # In 3.6-3.10 all flags come from sre_compile
+    else:
+        import_compiler = "import sre_compiler as _compiler"
     return parse(
-        """
-    import sre_compile
-    ASCII = sre_compile.SRE_FLAG_ASCII
-    IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE
-    LOCALE = sre_compile.SRE_FLAG_LOCALE
-    UNICODE = sre_compile.SRE_FLAG_UNICODE
-    MULTILINE = sre_compile.SRE_FLAG_MULTILINE
-    DOTALL = sre_compile.SRE_FLAG_DOTALL
-    VERBOSE = sre_compile.SRE_FLAG_VERBOSE
+        f"""
+    {import_compiler}
+    NOFLAG = 0
+    ASCII = _compiler.SRE_FLAG_ASCII
+    IGNORECASE = _compiler.SRE_FLAG_IGNORECASE
+    LOCALE = _compiler.SRE_FLAG_LOCALE
+    UNICODE = _compiler.SRE_FLAG_UNICODE
+    MULTILINE = _compiler.SRE_FLAG_MULTILINE
+    DOTALL = _compiler.SRE_FLAG_DOTALL
+    VERBOSE = _compiler.SRE_FLAG_VERBOSE
+    TEMPLATE = _compiler.SRE_FLAG_TEMPLATE
+    DEBUG = _compiler.SRE_FLAG_DEBUG
     A = ASCII
     I = IGNORECASE
     L = LOCALE
     U = UNICODE
     M = MULTILINE
     S = DOTALL
     X = VERBOSE
-    TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE
     T = TEMPLATE
-    DEBUG = sre_compile.SRE_FLAG_DEBUG
     """
     )
 

astroid/const.py

@@ -11,6 +11,7 @@
 PY38_PLUS = sys.version_info >= (3, 8)
 PY39_PLUS = sys.version_info >= (3, 9)
 PY310_PLUS = sys.version_info >= (3, 10)
+PY311_PLUS = sys.version_info >= (3, 11)
 BUILTINS = "builtins"  # TODO Remove in 2.8
 
 WIN32 = sys.platform == "win32"