From 038e335c8c1813b257e132a30f00a4d60ee0b153 Mon Sep 17 00:00:00 2001
From: Guldoman <giulio.lettieri@gmail.com>
Date: Mon, 11 Oct 2021 22:20:44 +0200
Subject: [PATCH] Show error message when `pcre2_match` fails

---
 src/api/regex.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/api/regex.c b/src/api/regex.c
index 1043b1c5..9f6bd3ee 100644
--- a/src/api/regex.c
+++ b/src/api/regex.c
@@ -68,8 +68,11 @@ static int f_pcre_match(lua_State *L) {
   int rc = pcre2_match(re, (PCRE2_SPTR)str, len, offset - 1, opts, md, NULL);
   if (rc < 0) {
     pcre2_match_data_free(md);
-    if (rc != PCRE2_ERROR_NOMATCH)
-      luaL_error(L, "regex matching error %d", rc);
+    if (rc != PCRE2_ERROR_NOMATCH) {
+      PCRE2_UCHAR buffer[120];
+      pcre2_get_error_message(rc, buffer, sizeof(buffer));
+      luaL_error(L, "regex matching error %d: %s", rc, buffer);
+    }
     return 0;
   }
   PCRE2_SIZE* ovector = pcre2_get_ovector_pointer(md);