Sort into Subfolder

Every month an invoice file with generic name "MPL Invoices for 06_June_2019" is moved to "2019 Invoices" folder.
The folder "2019 Invoices" has 12 sub-folders, one for each month with generic name "06_June_2019", "07_July_2019" etc.
Since the date element of the invoice file name changes each month, how can I get a name match in order to move file into correct monthly folder?
The folder "2019 Invoices" has 12 sub-folders, one for each month with generic name "06_June_2019", "07_July_2019" etc.
Since the date element of the invoice file name changes each month, how can I get a name match in order to move file into correct monthly folder?