please help to validate my username
i know its simple but i can't get it
i want only to validate the first 4 input of the username should be a letter.
i try to use the preg_match function but i can't get it correctly.
please help to validate my username
i know its simple but i can't get it
i want only to validate the first 4 input of the username should be a letter.
i try to use the preg_match function but i can't get it correctly.
This should check the username must start with 4 digit letter followed by numbers or letters.
preg_match('/^[A-Za-z]{4}[A-Za-z0-9]+$/', $username, $matches);
Are you trying to just validate that the first four characters of a username consists of alphabetic characters?
You can use the "substr" function:
$username = "MyUser";
if(preg_match('/[A-Za-z]/', substr('abcdef', 0, 4)) {
$valid = true;
}
else {
$valid = false;
}
T_T still not the correct one. anyone help?
$array = array(str_split($string, 4));
if(!is_numeric($array['0']))
{
echo "Te first 4 are letters";
}
else
{
echo "the first 4 are not letters";
}
Haven't tested this yet so please tell if it didn't work.
<?php
$subjects = array(
'abcd124',
'abc1234',
'passesTheTest',
'fai1TheTest',
'abc',
'123',
);
$pattern = '/^[a-zA-Z]{4}/';
foreach( $subjects as $test ){
if( preg_match( $pattern, $test ) > 0 ){
echo 'pass'.PHP_EOL;
} else {
echo 'fail'.PHP_EOL;
}
}
pass
fail
pass
fail
fail
fail
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