Best way to remove thousand separators from string amount using a regex

问题

I have variables that contain amounts and would like to remove the (US) thousand separators but also have to cover the scenario that there may be non-US formatted amounts where the comma is used for the decimals instead of for the thousands where I don't want to replace the comma.

Examples:

• 1,234,567.00 needs to become 1234567.00
• 1,234.00 needs to become 1234.00
  but
• 1.234.567,00 needs to remain unchanged as not US format (i.e. comma here is used for decimals)
• 1.234,00 needs to remain unchanged as not US format (i.e. comma here is used for decimals)

I was thinking of using the following but wasn't sure about it as I am pretty new to Regex:

myVar.replace(/(\d+),(?=\d{3}(\D|$))/g, "$1");

What is best solution here? Note: I just need to cover normal amounts like the above examples, no special cases like letter / number combinations or things like 1,2,3 etc.

回答1:

This one may suit your needs:

,(?=[\d,]*\.\d{2}\b)

Debuggex Demo

回答2:

Replace /,(?=\d*[\.,])/g with empty string?

http://regexr.com/39v2m

回答3:

if (string.match(/\.\d{2}$/) {
    string = string.replace(',', '');
}

or

string.replace(/,(?=.*\.\d+)/g, '');

回答4:

myVar = myVar.replace(/([.,])(\d\d\d\D|\d\d\d$)/g,'$2');

Removes the period . or comma , when used as a thousand separator.

来源：https://stackoverflow.com/questions/27105755/best-way-to-remove-thousand-separators-from-string-amount-using-a-regex