Php regular expression to extract the email address from the string

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Function extract_emails ($ str ){ // This regular expression extracts all emails from a string: $ Regexp = '/([a-z0-9 _.-]) + @ ([a-z0-9-]) +.) + ([a-z0-9] {2, 4}) +/I '; Preg_match_all ($ regexp, $ str, $ m );   Return isset ($ m [0])? $ M [0]: array (); }    $ Test_string = 'This is a test string...   Test1@example.org   Test different formats: Test2@example.org; <A href = "test3@example.org"> foobar </a> <Test4@example.org>   Strange formats: Test5@example.org Test6 [at] example.org Test7@example.net.org.com Test8 @ example.org Test9 @! Foo !. Org   Foobar '; Print_r (extract_emails ($ test_string ));