Various regular expressions are listed

Verifying the regular user name
$user _name = ' user_name12 ';
if (Preg_match ('/^[a-z\d_]{5,20}$/i ', $user _name)) {
Echo ' Your username is ok '. Php_eol. ' <br> ';
} else {
Echo ' Your username is error ';
}
Verify the date's regular
$date = Date (' y-m-d ');
if (Preg_match ('/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/i ', $date)) {
Echo ' date is ok '. Php_eol. ' <br> ';
} else {
Echo ' date is error ';
}
Verify postal code
$zipcode = "12354-5432";
if (Preg_match ('/^ ([0-9]{5}) (-[0-9]{4})? $/i ', $zipcode)) {
Echo ' ZipCode is ok '. Php_eol. ' <br> ';
} else {
Echo ' ZipCode is error ';
}
Mobile phone number Verification
$tel = "15043947153";
if (Preg_match ('/^0? ( 13[0-9]|15[012356789]|17[0123456789]|18[0-9]|14[0-9]) [0-9]{8}$/i ', $tel)) {
Echo ' Tel is ok '. Php_eol. ' <br> ';
} else {
Echo ' Tel is error ';
}
Mailbox Verification
$email = "[email protected]";
if (Preg_match ("/^[0-9a-za-z][email protected" ([0-9a-za-z]+) [.]) +[a-z]{2,4}$/i ", $email)) {
Echo ' Email is ok '. Php_eol. ' <br> ';
} else {
echo ' Email IE error ';
}

Various regular expressions are listed