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<?php $domains = [ 'a-.bc.com', 'a.bc-.com', 'a.bc.com-', ]; foreach ($domains as $domain) { echo $domain . PHP_EOL; var_dump(filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)); echo PHP_EOL; }
Output for git.master_jit, git.master
a-.bc.com bool(false) a.bc-.com bool(false) a.bc.com- string(9) "a.bc.com-"

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