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javascriptregexstrip

Rstrip based on regex in Javascript

I'm trying to validate a list of email addresses client-side. These addresses are separated by a comma or a semi-colon. They typically look like this:

'[email protected]; [email protected]; '
'[email protected], [email protected]'

I'm using a regular expression to split the string (I know how to validate each email address separately):

var separator = /[;,]+/;
var emails = value.split(separator);

I want to be able to remove the last separator if there is one. Server-side in python I'm doing something like that:

data = data.rstrip(separator)
value_list = re.split(separator, data)

With separator being the desired regexp.

My question is: how do I do this in Javascript ? More broadly, how do I remove the last characters of a string if they match a regexp ?

Solution

  • Rstrip can be done using end line $ symbol in the regex for .replace() method. I have also changed your regular expression so that it can additionally remove spaces.

    var separator = "[; ,]+",
    emails = value.replace(new RegExp(separator + "$"), "")
                  .split(new RegExp(separator));

console.log(emails);