var expression = "5,5x8÷7";
var expressoes = { ',': '.', 'x': '*', '÷': '/' };
var output = expression;
for (var exp in expressoes) {
output = output.replace(new RegExp(exp, 'g'), expressoes[exp]);
}
var output = expression;
for (var exp in expressoes) {
output = output.split(exp).join(expressoes[exp]);
}
let output = '';
for (var char of expression) {
output += char in expressoes ? expressoes[char] : char;
}
var output = '';
for (var i = 0, j = expression.length; i < j; i++) {
var char = expression[i];
output += char in expressoes ? expressoes[char] : char;
}