allow alpha_numeric and symbols preg_match php

I have the following function

public function alpha_custom($str)
   return ( ! preg_match("/^([-a-z0-9_-])+$/i", $str)) ? FALSE : TRUE;

So ,if the string contains anything other than alpha-numeric characters, underscores or dashes then it will return false.

Now i want to add the following

  1. SPACE
  2. &
  3. ( AND )
  4. . (period )

Please help me.

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