Thinking you'd have to do it in two steps?
Are the file names as shown?
And up to (at most) 99?
5:Remove, First: 2
10: Numbering, Mode: Prefix, Start: 30
Then, & it may depend more on the actual file naming.
1:RegEx:
- Code: Select all
Match: (.*)\s\d+$
Replace: \1
Match everything, up to an ending set of a, <space> followed by any number of digits.
Keep only all but the final digits.
10:Numbering, Mode: Suffix, Start: 30, Sep. <sp> (enter a physical space character in the box)
Maybe JavaScript Renaming could accomplish both at once?