Javascript - Regular expression for formatting values in real

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Hello, I am studying regular expressions and trying to make a function to format values. The idea is to receive a value and return it formatted. Example:

  • 400.00 --> 400,00
  • 150000.00 --> 150.000,00
  • 1500.00 --> 1.500,00

The solution I arrived at was this:

priceFormat(value){
    let price = value.toString().split('').reverse().join('').replace('.','')
    price = price.replace(/(\d{2})/, '$1,')
    price = price.replace(/(\d{3}(?!$))/g, '$1.') 
    return price.split('').reverse().join('')
}

I decided to flip the string to format it backwards, it seemed easier. I believe there must be a more interesting way to do this task, using a regex perhaps, some idea?

javascript regex

  • The parametervalue will just get the guy Number or the type may also be passed String? I ask why I want to know if what is passed in the parameter can or cannot be considered that the parameter will always be converted into Number.

  • It may be String, so much so that the first thing I did was convert because it comes as Number

  • It could not only replace (dot) '.' by ',' (comma)?

1 answer

1


I will post an alternative to regex.

Refers to a native javascript function toLocaleString.

const valor = 1542;

const currencyBRL = (value) => {
  const formattedValue = value.toLocaleString(
    'pt-BR', 
    { style: 'currency', currency: 'BRL' }
  );

    return formattedValue;
};

console.log(currencyBRL(valor)) // R$ 1.542,00

  • great, did not know this function, is even better than using regex, thank you very much!

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