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<?php $nik=1234567891234567; var_dump($nik); if(preg_match('/^[1-9]\d{15}$/', $nik)){ echo "Contains only numbers"; exit; }else{ echo "Contains non-numeric characters"; exit; }
Output for git.master, git.master_jit, rfc.property-hooks
int(1234567891234567) Contains only numbers

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