Replace numbers in Javascript

Question

I have this string: £0,00

Which i want to replace with float 3.95 for instance. But i want to keep the £ and the ","

So result -> £3,95

How would i do it?

--

Added some details:

Will the currency symbol always be a £?
The currency symbol might be before and sometimes behind the numbers. ie 0,00 kr

Will the separator always be,, or might it be. or even an arbitrary character?
The separator might be. sometimes.

Will there always be two decimal places?
The decimal will always be 2 places.

How many integer digits might there be, and will there be a thousands separator?
It will not be above 100.

Answer 1

function convert (proto, value) {
  return proto.replace (/0(.)00/, function (m, dp) {
    return value.toFixed (2).replace ('.', dp);
  });
}

the proto parameter specifies the format, it must have a sub-string consisting of a single 0 digit followed by any character followed by two 0 digits, this entire sub-string is replaced by the numeric value parameter replacing the decimal point with the character between the 0 digits in the proto.

Answer 2

<script type="text/javascript">
function Convert(Value) {
    return '£' + Value.toString().replace('.', ',');
}
alert(Convert(3.95));
</script>

Answer 3

Regular expression /(\D*)\s?([\d|.|,]+)\s?(\D*)/ will return an array with following values:

• [0] = whole string (eg "£4.30"
• [1] = prefix (eg. "£")
• [2] = numerical value (eg. "4.30")
• [3] = suffix (eg. "kr")

Usage: var parts = /(\D*)\s?([\d|.|,]+)\s?(\D*)/.exec(myValue);

It also handles cases where either prefix or suffix has following or leading space.

And whenever you need to replace the comma from number, just use the value.replace(",",".") method.