php - Regex: Strip non alpha numeric or punctuation -

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How do I use PHP to extract alpha, numeric, space or all non-paranoid characters?

I have tried the following, but left this punctuation mark. 

  preg_replace ("/ [^ a-zA-Z0- 9 \ s] /", "", $ str);  

  preg_replace ("/ [^ a-zA-Z0-9 \ S \ p {P}] / "," ", $ str);

Example: 

  php> Echo preg_replace ("/ [^ a-zA-Z0- 9 \ s \ p {P}] /", "", "⟺f✆oo☃. Ba⟗r!"); Foo times!

\ p {P} matches all Unicode punctuation (see Unicode). If you want to allow only specific punctuation marks, then add them to the denoted square class. Example: 

  preg_replace ("/ [^ a-zA-Z0-9 \?.] /", "", $ Str);

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