diff --git a/src/beesh.sh.in b/src/beesh.sh.in
index 7a92759..52391b0 100644
--- a/src/beesh.sh.in
+++ b/src/beesh.sh.in
@@ -145,17 +145,11 @@ function check_rebuild() {
 
     print_warning "please increase revision number"
 
-    beefile_dir=${beefile%/*}
     eval $(${BEEVERSION} "${beefile}")
 
     beefile_pattern="${PKGFULLNAME}-${PKGFULLVERSION}"
-    beefile_pattern=${beefile_pattern//+/\\+} # replace all + with \+
-    beefile_pattern=${beefile_pattern//./\\.} # replace all . with \.
-
-    beefile_max=$(for bf in $(ls "${beefile%/*}/${beefile_pattern}*.bee" "${BEE_BEEDIR}/${beefile_pattern}*.bee" 2>/dev/null |\
-                              grep -E "/${beefile_pattern}-[0-9]+.bee") ; do
-                      echo "${bf}"
-                  done | ${BEESORT} | tail -1)
+    shopt -s extglob
+    beefile_max=$( ls "${beefile%/*}/${beefile_pattern}"-+([0-9]).bee "${BEE_BEEDIR}/${beefile_pattern}"-+([0-9]).bee 2>/dev/null | ${BEESORT} | tail -1)
 
     eval $(${BEEVERSION} ${beefile_max})
     print_warning "cp ${beefile} ${PWD}/${PKGFULLNAME}-${PKGFULLVERSION}-$((PKGREVISION + 1)).bee"