let k1 = kpi1 + kpi2 + (kpi3 - kpi4) * kpi5; => {kpi1:1,kpi2:12,kpi3:2,kpi4:23,kpi5:78}
let k2 = kpi1 - (kpi2 * kpi3); => {kpi1:1,kpi2:12,kpi3:2,}
let k3 = kpi1 * kpi2 / kpi3; => {kpi1:1,kpi2:12,kpi3:2}:kpi,
let k1 = kpi1 + kpi2 + (kpi3 - kpi4) * kpi5; => {kpi1:1,kpi2:12,kpi3:2,kpi4:23,kpi5:78}
let k2 = kpi1 - (kpi2 * kpi3); => {kpi1:1,kpi2:12,kpi3:2,}
let k3 = kpi1 * kpi2 / kpi3; => {kpi1:1,kpi2:12,kpi3:2}:kpi, 
is this what you want?
come out with a regular match
const k1 = 'kpi1 + kpi2 + (kpi3 - kpi4) * kpi5';
const obj = {kpi1:1,kpi2:12,kpi3:2,kpi4:23,kpi5:78};
let k2 = k1.replace(/kpi[0-9]+/g,function(){
return obj[arguments[0]]
})
console.log(k2) // '1 + 12 + (2 - 23) * 78'
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