From d11d476126a6958211d9813ebf34c1e33f25055a Mon Sep 17 00:00:00 2001
From: neilpang <github@byneil.com>
Date: Mon, 9 Jan 2017 20:26:07 +0800
Subject: [PATCH] "Don't use [] around ranges in tr, it replaces literal square
 brackets."

---
 acme.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/acme.sh b/acme.sh
index 06b14ef6..d0f97b1a 100755
--- a/acme.sh
+++ b/acme.sh
@@ -573,7 +573,7 @@ _createkey() {
 _is_idn() {
   _is_idn_d="$1"
   _debug2 _is_idn_d "$_is_idn_d"
-  _idn_temp=$(printf "%s" "$_is_idn_d" | tr -d '[0-9]' | tr -d '[a-z]' | tr -d '[A-Z]' | tr -d '.,-')
+  _idn_temp=$(printf "%s" "$_is_idn_d" | tr -d '0-9' | tr -d 'a-z' | tr -d 'A-Z' | tr -d '.,-')
   _debug2 _idn_temp "$_idn_temp"
   [ "$_idn_temp" ]
 }