html - php preg_match accept alnum and chinese characters -

i preg_match syntax to

• accept letters , numbers (numbers alone not allowed)
• disallow spaces
• disallow special characters (e.g !@#$%^&.,)
• minimum of 3 chars 12.
• allow chinese characters (can alone, or letters or numbers, or both.)

this attempted code, seemed fail goal

if(preg_match('/^[a-za-z0-9\x{4e00}-\x{9fa5}]{3,12}+$/', $nickname)) { //accepted } else { //denied } 

thanks in advance.

change code below. ^(?!\d+$) won't allow strings contain numbers.

if(preg_match('~^(?!\d+$)[a-za-z0-9\x{4e00}-\x{9fa5}]{3,12}+$~u', $nickname)) { //accepted } else { //denied }