diff --git a/stdlib/3/sre_constants.pyi b/stdlib/3/sre_constants.pyi
index c1dba3a05ca8..10e393cc7c5b 100644
--- a/stdlib/3/sre_constants.pyi
+++ b/stdlib/3/sre_constants.pyi
@@ -38,3 +38,77 @@ SRE_FLAG_ASCII = ...  # type: int
 SRE_INFO_PREFIX = ...  # type: int
 SRE_INFO_LITERAL = ...  # type: int
 SRE_INFO_CHARSET = ...  # type: int
+
+
+# Stubgen above; manually defined constants below (dynamic at runtime)
+
+# from OPCODES
+FAILURE = ...  # type: _NamedIntConstant
+SUCCESS = ...  # type: _NamedIntConstant
+ANY = ...  # type: _NamedIntConstant
+ANY_ALL = ...  # type: _NamedIntConstant
+ASSERT = ...  # type: _NamedIntConstant
+ASSERT_NOT = ...  # type: _NamedIntConstant
+AT = ...  # type: _NamedIntConstant
+BRANCH = ...  # type: _NamedIntConstant
+CALL = ...  # type: _NamedIntConstant
+CATEGORY = ...  # type: _NamedIntConstant
+CHARSET = ...  # type: _NamedIntConstant
+BIGCHARSET = ...  # type: _NamedIntConstant
+GROUPREF = ...  # type: _NamedIntConstant
+GROUPREF_EXISTS = ...  # type: _NamedIntConstant
+GROUPREF_IGNORE = ...  # type: _NamedIntConstant
+IN = ...  # type: _NamedIntConstant
+IN_IGNORE = ...  # type: _NamedIntConstant
+INFO = ...  # type: _NamedIntConstant
+JUMP = ...  # type: _NamedIntConstant
+LITERAL = ...  # type: _NamedIntConstant
+LITERAL_IGNORE = ...  # type: _NamedIntConstant
+MARK = ...  # type: _NamedIntConstant
+MAX_UNTIL = ...  # type: _NamedIntConstant
+MIN_UNTIL = ...  # type: _NamedIntConstant
+NOT_LITERAL = ...  # type: _NamedIntConstant
+NOT_LITERAL_IGNORE = ...  # type: _NamedIntConstant
+NEGATE = ...  # type: _NamedIntConstant
+RANGE = ...  # type: _NamedIntConstant
+REPEAT = ...  # type: _NamedIntConstant
+REPEAT_ONE = ...  # type: _NamedIntConstant
+SUBPATTERN = ...  # type: _NamedIntConstant
+MIN_REPEAT_ONE = ...  # type: _NamedIntConstant
+RANGE_IGNORE = ...  # type: _NamedIntConstant
+MIN_REPEAT = ...  # type: _NamedIntConstant
+MAX_REPEAT = ...  # type: _NamedIntConstant
+
+# from ATCODES
+AT_BEGINNING = ...  # type: _NamedIntConstant
+AT_BEGINNING_LINE = ...  # type: _NamedIntConstant
+AT_BEGINNING_STRING = ...  # type: _NamedIntConstant
+AT_BOUNDARY = ...  # type: _NamedIntConstant
+AT_NON_BOUNDARY = ...  # type: _NamedIntConstant
+AT_END = ...  # type: _NamedIntConstant
+AT_END_LINE = ...  # type: _NamedIntConstant
+AT_END_STRING = ...  # type: _NamedIntConstant
+AT_LOC_BOUNDARY = ...  # type: _NamedIntConstant
+AT_LOC_NON_BOUNDARY = ...  # type: _NamedIntConstant
+AT_UNI_BOUNDARY = ...  # type: _NamedIntConstant
+AT_UNI_NON_BOUNDARY = ...  # type: _NamedIntConstant
+
+# from CHCODES
+CATEGORY_DIGIT = ...  # type: _NamedIntConstant
+CATEGORY_NOT_DIGIT = ...  # type: _NamedIntConstant
+CATEGORY_SPACE = ...  # type: _NamedIntConstant
+CATEGORY_NOT_SPACE = ...  # type: _NamedIntConstant
+CATEGORY_WORD = ...  # type: _NamedIntConstant
+CATEGORY_NOT_WORD = ...  # type: _NamedIntConstant
+CATEGORY_LINEBREAK = ...  # type: _NamedIntConstant
+CATEGORY_NOT_LINEBREAK = ...  # type: _NamedIntConstant
+CATEGORY_LOC_WORD = ...  # type: _NamedIntConstant
+CATEGORY_LOC_NOT_WORD = ...  # type: _NamedIntConstant
+CATEGORY_UNI_DIGIT = ...  # type: _NamedIntConstant
+CATEGORY_UNI_NOT_DIGIT = ...  # type: _NamedIntConstant
+CATEGORY_UNI_SPACE = ...  # type: _NamedIntConstant
+CATEGORY_UNI_NOT_SPACE = ...  # type: _NamedIntConstant
+CATEGORY_UNI_WORD = ...  # type: _NamedIntConstant
+CATEGORY_UNI_NOT_WORD = ...  # type: _NamedIntConstant
+CATEGORY_UNI_LINEBREAK = ...  # type: _NamedIntConstant
+CATEGORY_UNI_NOT_LINEBREAK = ...  # type: _NamedIntConstant