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function matchdomain($domain){
preg_match('/(([^@a-z0-9](w|-){0,61}?[a-z0-9]|[a-z0-9]).){1,}(aero|arpa|asia|biz|cat|com|coop|co|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|[a-z][a-z])(.[a-z][a-z]){0,1}/', $domain, $matches);
if (strlen($domain)==strlen($matches[0])){
return true;
}
return false;
}
$StrArray=array('www.china.com','china.com','我是china.com');
foreach ($StrArray as $value){
if (matchdomain($value)){
echo $value;
}
}
//=============================
function matchdomain($domain){
preg_match('/(([a-z0-9](w|-){0,61}?[a-z0-9]|[a-z0-9]).){1,}(aero|arpa|asia|biz|cat|com|coop|co|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|[a-z][a-z])(.[a-z][a-z]){0,1}/', $domain, $matches);
if (strlen($domain)==strlen($matches[0])){
return true;
}
return false;
}
$str='www.china.com';
$str2='china.com';
$str3='我china.com';
echo matchdomain($str);//www.china.com
echo matchdomain($str2);//china.com
echo matchdomain($str3);//china.com
//=============================
function matchdomain($domain){
preg_match('/(([a-z0-9](w|-){0,61}?[a-z0-9]|[a-z0-9]).){1,}(aero|arpa|asia|biz|cat|com|coop|co|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|[a-z][a-z])(.[a-z][a-z]){0,1}/', $domain, $matches);
return $matches[0];
}