From 93da6595cedaacd0d2524621913564cb60715f2a Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Mon, 2 Nov 2026 15:58:23 -0600
Subject: [PATCH] [Fix] `nvm_is_version_or_alias`: reject uppercase LTS names
 in every locale

bash 3.2, macOS's `/bin/sh`, matches a bracket range like `[a-z]` by collation order in a UTF-8 locale,
which interleaves upper- and lowercase letters,
so `lts/Iron` from a symlinked `.nvmrc` was accepted there.

Match with `[:lower:]` instead.
---
 nvm.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nvm.sh b/nvm.sh
index e72717c9..6140b386 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -953,7 +953,7 @@ nvm_is_version_or_alias() {
     ;;
     lts/*)
       case "${1#lts/}" in
-        '' | *[!a-z]*) return 1 ;;
+        '' | *[![:lower:]]*) return 1 ;;
       esac
       return 0
     ;;