Currently, there are several separators for the different program functions, e.g.:
Replace (3) is '|'
Case (4) is ':'
Filter (12) is ' '
For end-user ease, it may be a good idea to use the same separator for all of the functions, such as ':', as that is not an allowed character in Windows file names.
Also, if it was reprogrammed so that the separator for Filter (12) was changed from a space to another character, you could perhaps get rid of the need for quotation marks when including a space in the filter mask.