preg_match vs parse_url

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<?php
$url1 = '//google.com';
$url2 = 'http://google.com';
$url3 = 'https://google.com';
$url4 = 'google.com';
$email = 'some@email.com';
if( 1 === preg_match( '|^https?://|', $url1 ) ){
echo "url1 preg_matched\n";
}
 
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