zapier_code_include_at_symbol_for_twitter_username_mentions.js

/*
EXAMPLE:
input.tweetContent = This is a tweet about Zapier that mentions @zapier twice as well as reganstarr.
*/

var commaSeperatedTwitterUsernames = "Zapier,ReganStarr";

// You'll need to change input.tweetContent to match whatever input mapping you defined in the "Input" section of Zapier. (https://zapier.com/help/code/#how-does-it-work)
var tweetContent = input.tweetContent;

// split the comma-separated string of usernames into an array
var twitterUsernamesArray = commaSeperatedTwitterUsernames.split(',');

// filter out any empty strings
twitterUsernamesArray = twitterUsernamesArray.filter(function(n) {return n.length != 0});

for (var i = 0; i < twitterUsernamesArray.length; i++) {
	var twitterUsername = twitterUsernamesArray[i];

	// remove any accidental whitespace
	twitterUsername = twitterUsername.trim();

  
  // we need to account for any mentions of the username that already include the "@" symbol. Otherwise we might get two "@" sybmols by mistake (@@Zapier.) So first, we're actually going to strip out the "@" symbol from any usernames that were defined in the comma-separated variable.
  
  // create a global, case-insensitive regular expression of the username with the "@" symbol
	var regularExpressionOfUsernameWithAtSymbol = new RegExp("@" + twitterUsername,'gi');
  
  // replace all occurences of the regular expression with just the username
	tweetContent = tweetContent.replace(regularExpressionOfUsernameWithAtSymbol, twitterUsername);
  
  
  // Now that we are sure that we won't have any double "@" symbol occurences, like @@Zapier, we can go ahead and replace any mention of the defined usernames with the format of @username
  
  // create a global, case-insensitive regular expression of just the username
	var regularExpressionOfUsername = new RegExp(twitterUsername,'gi');

  // replace all occurences of the regular expression with the the '@' symbol and the username
	tweetContent = tweetContent.replace(regularExpressionOfUsername, '@' + twitterUsername);
}

output = {output: tweetContent};