Update - I have dispensed with the use of Folder Aliai in my strings and working exclusively with folder paths. This is proving much easier and I have a bit of traction. Thank goodness.
In this vein I have hit upon a problem related to the kind help provided above by the indefatigable @lxp ... which on account seems to be a pure JavaScript problem I have located it in the Off-topic forum....here:
Find and Replace Backslash in a JavaScript String