gistfile1.js

// This will match an email given any string
// note even my ' in the string was fine ;D
var re = /[\w]+@[\w-]+\.[\w]+/g; 
var str2 = "my email is not optikalefx@me.com it's actually devbrights@gmail.com"; 
var myArray = str2.match(re);
myArray



//search inside just a target <tag> in DevTools console using RegEx 
  //1. then convert that object into a string
    var text = $('<div>').append($('#file-gistfile1-txt-LC4').clone()).html(); text;
      // "<div class="line" id="file-gistfile1-txt-LC4" style="display: block;">var str2 = "my email is not optikalefx@me.com it's actually devbrights@gmail.com";</div>"
    
  //2. and then use regex to match just emails (of that new string only)
    var re = /[\w]+@[\w-]+\.[\w]+/g; 
    var myArray = text.match(re); myArray
      //["optikalefx@me.com", "devbrights@gmail.com"]