how to make this Array(need help)

[megatrue]

hello, I'm a newbie. Anyone can help me?
I have a problem with array.

$a=array("Dog","www.mydomain.com","Horse");

How to find www.mydomain.com with Regular expression and remove it. then rebuild a new arry without "www.mydomain.com". i know how to make a Regular expression.

[Dismounted]

No need to use "intensive" regex functions.

PHP Code:

$a = array(
    'Dog',
    'www.mydomain.com',
    'Horse'
);
$find = array_keys($a, 'www.mydomain.com');

foreach ($find AS $key)
{
    unset($a[$key]);
} 


[megatrue]

thank you
but if my array is:

PHP Code:

$a = array(
    'Dog',
    'www.mydomain.com',
    'www.mydomain.com/index.php',
    'www.myotherdomain.com/index.php',
    'www.myotherdomain.com',
    '...',
    '...',
    'Horse'
); 


this function array_keys() is not fittingly.