Regex to replace multiple substrings of length n, split from a string in javascript -

got results both dividing substrings , replacing multiple substrings using map array. split string n-length before substrings replaced

eg: aabbccddee

maparray : {   aa: a,   ab: b, <<<<   bb: f,   cc: c,   dd: d,   ee: e } 

result : afcde

i need string split length 2, code won't replace 'ab', instead of replacing 'aa' , 'bb' seperately.

can explain more if needed! in advance!

the code split string parts of 2 character length comes here, applies map , outputs resulting string.

var maparray = {    aa: 'a',    ab: 'b',    bb: 'f',    cc: 'c',    dd: 'd',    ee: 'e'  };    var inp = "aabbccddeex";  var out = inp.match(/.{1,2}/g).map(a => maparray[a] || "-").join('');    console.log(out);