Increment %z hex numbers with VIM? -

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is there way increment %z hex numbers vim? typically can doing ctrl + a normal numbers. unfortunately using old school system uses %z rather 0x denote hexadecimal numbers. i've tried 

set nf=hex

but sadly works 0x hex numbers. come across before? haven't found on google machine.

i don't know %z prefix; tried quick , dirty function increment numbers %z0f; want? should able add mapping (but not since used in function!) :map <c-p> :call myincrement()<cr>

of course should customize according needs; line 17 reset position of cursor after incrmeenting; may want replace l:c l:b (or maybe l:a) , choose most.

function! myincrement()   let l:l = line(".")   let l:c = col(".")   let l:a = 0   let l:b = 0    let l:s = search('%z[0-9a-f]\+', 'bcw',l:l)   if l:s == l:l     let l:a = col(".")     let l:s = search('%z[0-9a-f]\+', 'ecw',l:l)     let l:b = col(".")     if ((l:a<=l:c)&&(l:c<=l:b))       call cursor(l:l, l:a+2)       silent exe "normal 0x\e\<c-a>"       call cursor(l:l, l:a+2)       silent exe "normal 3x"       call cursor(l:l, l:c)     endif   endif endfunction

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