php - Retrieve and replace email address using preg_match & preg_replace -

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I want to retrieve an email address from an article when the article is submitted and * .

I'm using preg_match ($ pattern, $ theme, $ matches). Does not work throws an error.

$ pattern looks like this 

  ^ [_ a-z0-9 -] + (\. [_A-z0-9-] +) * @ [A-z0-9 -] + (\ [A-z0-9 -] +) * (\. [Az] {2,3}) $   
 I email addresses I want to retrieve it and I want to change it in article.  
 I appreciate any help.   
 
 
 is regex:  
  # ^ [^.] [ \ W - \.] {1,64} [^ \.] @ ([\ W-.] *) (\. \ W {2,6}) $ # i   < / Div>

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