1 files changed, 6 insertions, 0 deletions
diff --git a/src/nvim/regexp_nfa.c b/src/nvim/regexp_nfa.c
index c93164ed7e..2f4b1b98c1 100644
--- a/src/nvim/regexp_nfa.c
+++ b/src/nvim/regexp_nfa.c
@@ -2094,6 +2094,12 @@ static int nfa_regatom(void)
       break;
 
     case '#':
+      if (regparse[0] == '=' && regparse[1] >= 48
+          && regparse[1] <= 50) {
+        // misplaced \%#=1
+        semsg(_(e_atom_engine_must_be_at_start_of_pattern), regparse[1]);
+        return FAIL;
+      }
       EMIT(NFA_CURSOR);
       break;