Allow special chars like @ and dots in user name

ebulk

@@ -194,7 +194,7 @@ function storeCredentials {
     echo
     echo "User:"
     read -e USER
-    re='^[A-Za-z][-A-Za-z0-9_]*$'
+    re='^[A-Za-z][-A-Za-z0-9_.@]*$'
     if ! [[ $USER =~ $re ]] ; then
       echo
       echo -e "${ORANGE}[ERROR] Invalid user name. Did enter an invalid character?"

ebulk-data/embulk-wendelin-dataset-tool/lib/embulk/dataset_utils.rb

@@ -152,7 +152,7 @@ class DatasetUtils
         puts
         print "User:"
         user = gets.chomp
-        if not /^[A-Za-z][-A-Za-z0-9_]*$/.match(user)
+        if not /^[A-Za-z][-A-Za-z0-9_.@]*$/.match(user)
           puts
           @logger.error("Invalid user name. Did enter an invalid character?", print=TRUE)
           @logger.info("Please enter a valid user name.", print=TRUE)