let g:mi#const#alpha_lower = 'abcdefghijklmnopqrstuvwxyz'
let g:mi#const#alpha_upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
let g:mi#const#digits = '0123456789'
let g:mi#const#alpha_all = g:mi#const#alpha_lower .. g:mi#const#alpha_upper
let g:mi#const#alnum = g:mi#const#alpha_all .. g:mi#const#digits