fix version matching

src/rstudio-server/install.sh

@@ -63,20 +63,22 @@ check_packages() {
 find_version_from_git_tags() {
     local variable_name=$1
     local requested_version=${!variable_name}
+    local tmp
     if [ "${requested_version}" = "none" ]; then return; fi
     local repository=$2
     local prefix=${3:-"tags/v"}
     local separator=${4:-"."}
     if [ "$(echo "${requested_version}" | grep -o "." | wc -l)" != "2" ]; then
         local escaped_separator=${separator//./\\.}
-        local regex="${prefix}\\K[0-9]+${escaped_separator}[0-9]+${escaped_separator}[0-9]+\\+[0-9]+$"
+        local regex="${prefix}\\K[0-9]+${escaped_separator}[0-9]+${escaped_separator}[0-9]+\+[0-9]+$"
         local version_list
         version_list="$(git ls-remote --tags "${repository}" | grep -oP "${regex}" | tr -d ' ' | tr "${separator}" "." | sort -rV)"
         if [ "${requested_version}" = "latest" ] || [ "${requested_version}" = "current" ] || [ "${requested_version}" = "lts" ]; then
             declare -g "${variable_name}"="$(echo "${version_list}" | head -n 1)"
         else
+            tmp=${requested_version//+/\\+}
             set +e
-            declare -g "${variable_name}"="$(echo "${version_list}" | grep -E -m 1 "^${requested_version//./\\.}([\\.\\s]|$)")"
+            declare -g "${variable_name}"="$(echo "${version_list}" | grep -E -m 1 "^${tmp//./\\.}([\\.\\s]|$)")"
             set -e
         fi
     fi