How to convert a join mail id with one id

I'm assuming you want to convert a join mail ID (e.g., [email protected][email protected]) to a single ID (e.g., [email protected]).

Here's a simple way to do it in most programming languages:

Using a regular expression

You can use a regular expression to extract the usernames and concatenate them with an underscore (_) in between.

Here's an example in JavaScript:

function convertJoinMailId(joinMailId) {
  const regex = /(.+?)\+([^.]+)\./;
  const match = joinMailId.match(regex);
  if (match) {
    const username1 = match[1];
    const username2 = match[2];
    return `${username1}_${username2}@${joinMailId.split('@')[1]}`;
  }
  return joinMailId; // return original ID if no match found
}

Using string manipulation

Alternatively, you can use string manipulation functions to achieve the same result:

Here's an example in Python:

def convert_join_mail_id(join_mail_id):
    parts = join_mail_id.split('+')
    return f"{parts[0]}_{parts[1].split('@')[0]}@{join_mail_id.split('@')[1]}"

Testing the functions

You can test these functions with the following examples:

Remember to adjust the regular expression or string manipulation code according to your specific requirements and the format of your join mail IDs.