How write multiple prepends/appens in a single EL expression?

[Eric Chaves]

Hi folks,

Sorry for another newbie question. =) I'm trying to write a single EL
expression to perform multiples string manipulation but I keep hitting an
invalid EL expression.

What would be the correct way to write this expression:
${sftp.remote.host:prepend("sftp://";):append:("/"):append(${path}):append("/"):append(${filename})}
?

Thanks in advance,

Eric