Question

I am a beginner, how do I combine them:

var mystring = "[e-mail]";
document.write(mystring.replace(/@/, "&&"));

prints my.email&&computer.com

var mystring = "[e-mail]";
document.write(mystring.replace(/\./, "##"));

prints my##[e-mail]

I have two questions:
How do I make this regex (mystring.replace(/./, “##”) to after @ change the dot to ## and how can I combine those two lines into one, and final read is:my.email&&computer##com

Answer 1

input : [e-mail]

result : my.first.last.email&&example##computer##com

Solution 1:

var mystring = "[e-mail]";
//replace '.' after '@' with '##', then replace '@' with '&&'.
var result = mystring.replace(/(?!.*@)\./g, "##").replace(/@/, "&&");
document.write(result);

Solution 2 (configurable):

var mystring = "[e-mail]";

var replacements = {
                    '@' : '&&',
                    '.' : '##'
                   };

var str =  "[e-mail]";

//match latter part of the string
var result = str.replace(/@\w+(\.\w+)+/g, function(at_and_after) {
    //replace all '.' and '@' in that part.
    return at_and_after.replace(/@|\./g, function(m) { return replacements[m]});
});
document.write(result);  //console.log(result) or alert(result) is a better way for demo