(Vimscript) Move lines that match a patter to the top of buffer?

I am trying to write a vimscript function that would search all lines that match a certain pattern "^\s*import\s\s*.*;" and move them to the top of the buffer. This is to move all imports in a java file to the top.

Even better would be to move all the import line below the package line on the java source file.

In the editor I can use this command to get the desired effect:

" Moves all import lines to the top
v/^\s*import\s\s*.*;/normal ddGp

" Moves the pacakge line to the top, above the imports
v/^\s*package\s\s*.*;/normal ddGp

How to translate that visual command to work in vimscript?

regards,
Horacio

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