Question 41320 in PHP Question posted in
Official manual can be found here.

Restriction of '@' in php

Problem in restricting "@" in username of signup form.
I am creating a website where i want to know how to restrict "@" in php.
I tried preg replace

preg_replace('/@/', '@', $username);

but it is not working. What is the appropriate ‘preg_replace’ value to restrict ‘@’ in php.

Tags:

2

Answers


  1. 0

    You can use str_replace preg_replace to remove all ocurrencies of the @ symbol

    All of these are essentially equivalent.

    $username = str_replace('@','',$username);
$username = preg_replace('/@/','',$username);
$username = preg_replace('/[^@']/', '', $username);

    The last one can take a list of restricted characters within the square brackets

    If you want to just check for an @ symbol, I would use strpos instead

    if(strpos($username, '@') !== false){
  // do something
}
    Login or Signup to reply.
  2. 0

    To check the presence of a substring, you can use str_contains

    $username = $_POST['username']; //or whatever source
if (str_contains($username, '@')) {
    throw new Exception('Username cant contain @'); //or whatever expected behavior
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search