David Woodroffe writes:

> Can someone advise me on how to use HP functions such as LEN, RTRIM and
> EDIT when the input string contains a mix of single and double quotes.

It sounds like you're trying something like

        setvar string_len  len( "!some_string" )

While this works fine for strings without double quotes, the syntax is
more than what is actually necessary.  Instead, try

        setvar string_len  len( some_string )

It's rare that you need to evaluate (via '!') a string variable.
The only case that comes to mind is with 'echo'.

--Glenn