From b8e542b46350cc1e7975bb711082e4cc6fcb7c82 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Fri, 9 Dec 2022 14:17:35 +0900
Subject: Make absent operator work at the end of the input string

https://bugs.ruby-lang.org/issues/19104#change-100542
---
 regexec.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'regexec.c')

diff --git a/regexec.c b/regexec.c
index f7c5d12133..a9822ee064 100644
--- a/regexec.c
+++ b/regexec.c
@@ -3774,6 +3774,11 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 	  DATA_ENSURE(0);
 	  p += addr;
 	}
+	else if (s == end) {
+	  /* At the end of the string, just match with it */
+	  DATA_ENSURE(0);
+	  p += addr;
+	}
 	else {
 	  STACK_PUSH_ALT(p + addr, s, sprev, pkeep); /* Push possible point. */
 	  n = enclen(encode, s, end);
-- 
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