From 73adc1f3ddda54da9faaf155cf6bf95b613ac221 Mon Sep 17 00:00:00 2001
From: hyung-hwan <hyunghwan.chung@gmail.com>
Date: Mon, 9 Mar 2020 15:34:34 +0000
Subject: [PATCH] changed the tre parser to treat a backslash as an escaper
 inside []

---
 qse/lib/cmn/tre-parse.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/qse/lib/cmn/tre-parse.c b/qse/lib/cmn/tre-parse.c
index 9203d701..0d15d099 100644
--- a/qse/lib/cmn/tre-parse.c
+++ b/qse/lib/cmn/tre-parse.c
@@ -278,6 +278,15 @@ tre_parse_bracket_items(tre_parse_ctx_t *ctx, int negate,
 				if (min > max)
 					status = REG_ERANGE;
 			}
+		/* QSE: handle \ as an escaper */
+			else if (re + 1 < ctx->re_end && *re == CHAR_BACKSLASH)
+			{
+				/* escaped character inside [] */
+				min = max = *(re + 1);
+				re += 2;
+			}
+		/* END QSE */
+
 			else if (re + 1 < ctx->re_end
 			         && *re == CHAR_LBRACKET && *(re + 1) == CHAR_PERIOD)
 				status = REG_ECOLLATE;