How to allow wordpress to create username with symbols like +

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I want to allow users to create username with + symbol. but wordpess removing the symbol by the register validation process.
If I gave username as abcd+123, the user registered with username as abcd123.
I need the username registered as it is with + symbol.

Answers are greatly appreciated.

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  1. We need to add a filter to ‘sanitize_user’.

    Here is the sample code that will work for you.

    add_filter( 'sanitize_user', 'tubs_sanitize_user', 10, 3);
function tubs_sanitize_user($username, $raw_username, $strict) {
    $new_username = strip_tags($raw_username);
    // Kill octets
    $new_username = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '', $new_username);
    $new_username = preg_replace('/&.?;/', '', $new_username); // Kill entities

   // If strict, reduce to ASCII for max portability.
   if ( $strict )
        $new_username = preg_replace('|[^a-z0-9 _.-@+]|i', '', $new_username);

    return $new_username;
}


    Note: This code is the modified version of the original WordPress sanitize_user function.