diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index 108f29e..64c69c6 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
+
 set -e
+shopt -s extglob
 
 declare -A aliases
 aliases=(
@@ -7,9 +9,14 @@
 	[1.580.3]='latest'
 )
 
-versions=( */ )
-versions=( "${versions[@]%/}" )
-versions=( $(IFS=$'\n'; sort -Vr <<< "${versions[*]}") )
+versions() {
+	local IFS=$'\n'
+	local versions=( "${@%/}" )
+	sort -Vr <<< "${versions[*]}"
+}
+
+lts_versions=( $(versions *.*.*/) )
+weekly_versions=( $(versions !(*.*.*)/) )
 url='git://github.com/cloudbees/jenkins-ci.org-docker'
 
 echo '# maintainer: Nicolas De Loof <nicolas.deloof@gmail.com> (@ndeloof)'
@@ -26,8 +33,8 @@
 done
 
 echo "# group: Previous LTS Releases"
-for version in "${versions[@]}"; do
-	if [[ "${aliases[$version]}" || "$version" != *.*.* ]]; then
+for version in "${lts_versions[@]}"; do
+	if [ "${aliases[$version]}" ]; then
 		continue
 	fi
 
@@ -37,8 +44,8 @@
 echo
 
 echo "# group: Previous Weekly Releases"
-for version in "${versions[@]}"; do
-	if [[ "${aliases[$version]}" || "$version" == *.*.* ]]; then
+for version in "${weekly_versions[@]}"; do
+	if [ "${aliases[$version]}" ]; then
 		continue
 	fi