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Editorial Team
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Asked: 2026-05-19T01:45:25+00:00

Why is this code working? I want to take the input variable and getting

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Why is this code working? I want to take the input variable and getting the emails out of it. It’s not working though. Can someone help me?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript">


var email = /[a-z0-9\.&%]+@(?:[a-z1-9\-]+\.)+[a-z]{2,4}/i;
var input = "hi4d@gmail.com@gmail.com text here shaagd4@@fdfdg.ct hefds@4564dh-dsdgd.ly";
var testout = true;
var output;
while(testout === true)
{
var execoutput = email.exec(input);
testout = email.test(input);
if(!output) {output = '';}
if(testout === true)
{
output += "<p>An email found was: " + execoutput[0] + ".</p>";
input = input.substring(execoutput[0].length);
}
}
document.write(output);
</script>
</head>

<body>
</body>
</html>
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1 Answer

  1. Editorial Team

    Try this: (on jsfiddle)

    var email = /[a-z0-9\.&%]+@(?:[a-z0-9\-]+\.)+[a-z]{2,4}/i;
var input = "hi4d@gmail.com@gmail.com text here shaagd4@@fdfdg.ct hefds@4564dh-dsdgd.ly";
var output = '';

for (;;) {
    var execoutput = email.exec(input);

    if (!execoutput) {
        break;
    }

    output += "<p>An email found was: " + execoutput[0] + ".</p>";
    input = input.substring(execoutput.index + execoutput[0].length);
}

document.write(output);

    Note a few problems I’ve corrected:

    • The regex did not match the 0 character in the domain part. None of your input strings contained this character in the domain part, but it was a bug nonetheless.
    • You can’t just pull off the first N characters of the input string when N is the length of the matched string, because it may not have matched at position 0. You have to add the index of the match too, or you might match the same address multiple times.
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