From 7f21e5c9d0bda1d95fcf5a364b4e52862474f337 Mon Sep 17 00:00:00 2001
From: vwyu <vwyu@users.noreply.github.com>
Date: Fri, 11 Jan 2019 00:35:05 +0900
Subject: [PATCH] Escape literal special characters in sre_to_string method.

---
 exrex.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/exrex.py b/exrex.py
index 37d2b3d..b8f4aa2 100644
--- a/exrex.py
+++ b/exrex.py
@@ -306,7 +306,8 @@ def sre_to_string(sre_obj, paren=True):
                 prefix = '^'
             ret += u'[{0}{1}]'.format(prefix, sre_to_string(i[1], paren=paren))
         elif i[0] == sre_parse.LITERAL:
-            ret += unichr(i[1])
+            u = unichr(i[1])
+            ret += u if u not in sre_parse.SPECIAL_CHARS else '\\{0}'.format(u)
         elif i[0] == sre_parse.CATEGORY:
             ret += REVERSE_CATEGORIES[i[1]]
         elif i[0] == sre_parse.ANY: