prepend
Description: The prepend function
returns the result of prepending the argument to the value of the Subject. If the subject is
null, returns the argument itself.
Subject Type: String
Arguments:
value : The String to prepend to the beginning of the Subject
Return Type: String
Examples: If the "filename" attribute has the
value "filename.txt", then the Expression ${filename:prepend('a
brand new ')} will return "a brand new filename.txt".