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<?php var_dump(filter_var('publisher@i-butler.de', FILTER_VALIDATE_EMAIL)); var_dump(preg_match( "/^[a-z0-9._\-ÄÖÜäöüß\+]+@[A-Z0-9.\-ÄÖÜäöü]{1,63}\.[A-Z]{2,6}$/ui", 'publisher@i-butler.de' ));
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(21) "publisher@i-butler.de" int(1)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Call to undefined function filter_var() in /in/Nojkc on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: filter_var() in /in/Nojkc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: filter_var() in /in/Nojkc on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: filter_var() in /in/Nojkc on line 3

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