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let s = "23ksdk45je70"
s = s.match(/\d+/g)
// s=s.match(/\d/g) considers 23 as 2+3, 45 as 4+5 and 70 as 7+0
let sum = 0
for (let i = 0; i < s.length; i++) {
sum = sum + parseInt(s[i])
}
console.log(sum);
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