regex para contar personajes
( *?[0-9a-zA-Z] *?){10,}
Salo Hopeless
( *?[0-9a-zA-Z] *?){10,}/^[a-z]{0,10}$/
{3} exactly 3
{6,} at least 6
{2,5} 2 to 5%[0-9a-fA-F]{2,}