UnderPhp UnderPhp - 3 months ago 124
PHP Question

Instagram username Regex -PHP

I have register form and input of "instagram-username".

Instagram username can included only:

a-z A-Z 0-9 dot(.) underline(_)


This is my code:

if(!empty($instaUsername) && preg_match("/([A-Za-z._])\w+/", $instaUsername)) {
throw new Exception ("Your name Instagram is incorrect");
}


When
$instaUsername = "name.123"
or
"name_123"
this give me the error.

How to make a regular expression according to the following requirements?

a-z A-Z 0-9 dot(.) underline(_)


I would love to have good tutorials on regex as comment.

Answer

Moving forward from the comment section, this is what you want:

if(!empty($instaUsername) && preg_match('/^[a-zA-Z0-9._]+$/', $instaUsername)) {
            throw new Exception ("Your name Instagram is incorrect");
}