如何在preg_match模式中留出空间？

So far I tried to make pattern which allows alpha-numeric but not first number and only number. So far if I add space I still get an error like I used that pattern with name so what. If I can add space also between name will be amazing. Here is my pattern:

preg_match("/^(?!\d*$)[a-z\d]*$/i"

preg_match("/^(?!\s\d*$)[a-z\s\d]*$/i");

\s means any kind of space.