diff --git a/regen/embed.pl b/regen/embed.pl
index a2c7130d4d4b..430a8339bfdb 100755
--- a/regen/embed.pl
+++ b/regen/embed.pl
@@ -1722,11 +1722,7 @@ BEGIN
     MDEREF_MASK
     MDEREF_reload
     MDEREF_SHIFT
-    memBEGINPs
-    memBEGINs
     MEMBER_TO_FPTR
-    memENDPs
-    memENDs
     memGE
     memGT
     memLE
@@ -2829,7 +2825,6 @@ BEGIN
     STD_PAT_MODS
     STD_PMMOD_FLAGS_CLEAR
     STORE_LC_NUMERIC_SET_STANDARD
-    strBEGINs
     Strerror
     STRFMON_LOCK
     STRFMON_UNLOCK
@@ -3779,6 +3774,8 @@ BEGIN
 
                            PERL_IN_REGCOMP_ANY
                            PERL_EXT_RE_BUILD
+                           PERL_EXT_RE_DEBUG
+                           PERL_EXT_RE_STATIC
                            PERL_IN_REGEX_ENGINE
                            PLUGGABLE_RE_EXTENSION
                          );
@@ -3809,6 +3806,9 @@ BEGIN
 $cpp_ifdef_constraints{PERL_DEBUG_READONLY_OPS} = 0;
 $cpp_ifdef_constraints{PERL_DEBUG_DUMPUNTIL} = 0;
 $cpp_ifdef_constraints{PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS} = 0;
+$cpp_ifdef_constraints{PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION} = 0;
+$cpp_ifdef_constraints{PERL_ENABLE_POSITIVE_ASSERTION_STUDY} = 0;
+$cpp_ifdef_constraints{PERL_ENABLE_TRIE_OPTIMISATION} = 0;
 $cpp_ifdef_constraints{EXPERIMENTAL_INPLACESCAN} = 0;
 
 # Appears to be obsolete; App:s2p, etc were created to handle this
@@ -3820,7 +3820,9 @@ BEGIN
 $cpp_ifdef_constraints{WIN32_USE_FAKE_OLD_MINGW_LOCALES} = 0;
 
 $cpp_ifdef_constraints{PERL_EXT} = 0;
-$cpp_ifdef_constraints{PERL_EXT_RE_BUILD} = 0;
+$cpp_ifdef_constraints{PERL_EXT_IO} = 0;
+$cpp_ifdef_constraints{PERL_EXT_LANGINFO} = 0;
+$cpp_ifdef_constraints{PERL_EXT_POSIX} = 0;
 
 # This program evaluates the conditionals surrounding every #define in every
 # examined header.  It turns out that in many cases, using the constraints in