Need PHP function written for wpallimport wordpress plugin

I want the wpallimport plugin to rename files for images added in the post content. Currently it only does it for images added to the images field.


The problem I have is described in this support thread Upgrade to see actual info fact, the maker of the plugin replied and even provided an example function but it needs to be modified.
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This should be an easy task to do. The plugin has a free version which you can check. If you can do this task please contact me.