diff --git a/src/build.sh b/src/build.sh
index c4868c81b57c5656a1869b5b7462cb6a79ba31db..459e449b1423bc7d35c4c9aeb7fa0a0c6ee5505a 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -34,7 +34,7 @@ fi
 sync_successful=true
 
 use_openjdk_from_ubuntu=false
-branch_dir=$(sed 's/.*-\([a-zA-Z]*\)$/\1/' <<< "${BRANCH_NAME}")
+branch_dir=$(sed -E 's/^v[0-9](\.[0-9]*){0,2}(-(beta|alpha|rc)(\.[0-9]*){0,1}){0,1}-(nougat|oreo|pie|q|r)(-[a-zA-Z0-9_]*)*$/\5/' <<< "${BRANCH_NAME}")
 branch_dir=${branch_dir^^}
 
 if [ -n "${BRANCH_NAME}" ] && [ -n "${DEVICE}" ]; then
@@ -140,7 +140,7 @@ if [ -n "${BRANCH_NAME}" ] && [ -n "${DEVICE}" ]; then
   if [ "$sync_successful" = true ]; then
     repo forall -c 'git lfs pull'
   fi
-  
+
 
   if [ ! -d "vendor/$vendor" ]; then
     echo ">> [$(date)] Missing \"vendor/$vendor\", aborting"