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Solved using replacement. solution in Clear category for [old] Brackets by planigan
"use strict";
function brackets(expression){
let exp = expression.replace(/\d|[+\-*/]/g, ''),
prev = '';
while ( exp.length !== prev.length ) {
prev = exp;
exp = exp.replace('()', '')
.replace('{}', '')
.replace('[]', '');
}
return exp.length === 0;
}
Oct. 22, 2016
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