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<?php $name = "He/llo W+or_ld Test=Code"; if( preg_match_all('/[^a-zA-Z ]/', $name, $res) ){ echo "Unavailable Characters: " . implode('', $res[0]); }
Output for git.master, git.master_jit, rfc.property-hooks
Unavailable Characters: /+_=

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