Regular expression of monetary value

Question

Hello I have the following function

function CarregarMascaras() {
    $('[data-mascara=numeroMonetario]').keyup(function () {
    this.value = this.value.replace(/[^0-9]+[^\,]?[^0-9]+/g, '');
    }).on('paste', function () {
    this.value = this.value.replace(/[^0-9]+[^\,]?[^0-9]+/g, '');
    });
}

Her idea is as follows, as you type she checks what’s there and keeps it in a format like: N,N. Where N is any number, but when testing it is accepting numbers of the type N,N,N or N.N.N. I would like this function to accept only numbers of the type: N,N.

Answer 1

To remove all but the first comma you can do so:

$('[data-mascara="numeroMonetario"]').on('paste keyup', function() {
    this.value = this.value.split(/[^\d,]/).filter(Boolean).join('');
    var parts = this.value.split(',').filter(Boolean);
    if (parts.length > 1) this.value = [parts.shift()].concat(parts.join('')).join(',');
});

Example: https://jsfiddle.net/pet80e7o/1

What does that code do?

• joins both events to not repeat the code
• with this.value = this.value.split(/[^\d,]/).filter(Boolean).join(''); I take back anything but numbers and commas
• with var parts = this.value.split(',').filter(Boolean);; breaks the code into parts separated by commas and cleans empty parts
• [parts.shift()] keep the first part and remove it from parts
• parts.join('') joins the other parts without commas
• .join(','); together the first part with the rest