[SOLVED] Simple Validation

[phpretard]

I do not want any special characters but spaces and capital Letters are OK

 

The code below is blocking spaces and capital letters I think

 

if (!preg_match('/^[^a-z0-9-_]+$/i',$docName)){
$error="<script>alert('The Document Name May Only Contain Letter And Numbers')</script>";
}

 

Any help?

[only one]

preg_match('/^[a-zA-Z0-9_- ]+$/i', $docName)