From 55bdc121893b41dd77cf036e74c587f52c55b695 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter_e@gmx.net>
Date: Fri, 25 Sep 2009 20:51:37 +0000
Subject: [PATCH] Remove backup states from Unicode escapes patch

---
 src/backend/parser/scan.l | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/backend/parser/scan.l b/src/backend/parser/scan.l
index 99a4c5649a..0b8d5f7cd8 100644
--- a/src/backend/parser/scan.l
+++ b/src/backend/parser/scan.l
@@ -231,7 +231,7 @@ xeescape		[\\][^0-7]
 xeoctesc		[\\][0-7]{1,3}
 xehexesc		[\\]x[0-9A-Fa-f]{1,2}
 xeunicode		[\\](u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})
-xeunicodebad	[\\]([uU])
+xeunicodefail	[\\](u[0-9A-Fa-f]{0,3}|U[0-9A-Fa-f]{0,7})
 
 /* Extended quote
  * xqdouble implements embedded quote, ''''
@@ -575,7 +575,7 @@ other			.
 <xeu>\n			|
 <xeu><<EOF>>	{ yyerror("invalid Unicode surrogate pair"); }
 
-<xe>{xeunicodebad}	{
+<xe,xeu>{xeunicodefail}	{
 						ereport(ERROR,
 								(errcode(ERRCODE_INVALID_ESCAPE_SEQUENCE),
 								 errmsg("invalid Unicode escape"),
-- 
2.30.2