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<?php $strings = [ ')(8234@#$ABCFG3478&* hello', // mix '456456', // numeric 'ghijkl', // alphabetic '!@#$%^&*(', // non-alphanumeric ]; foreach ($strings as $string) { var_export( [ 'string' => $string, 'firstAlphaNumeric1' => preg_match('/[a-z0-9]/i', $string, $match) ? $match[0] : null, 'firstAlphaNumeric2' => $string[strcspn($string, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789')] ?? null, 'firstAlphaNumeric3' => $string[strcspn($string, 'A..Zabcdefghijklmnopqrstuvwxyz0123456789')] ?? null, ] ); echo "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'string' => ')(8234@#$ABCFG3478&* hello', 'firstAlphaNumeric1' => '8', 'firstAlphaNumeric2' => '8', 'firstAlphaNumeric3' => '8', ) array ( 'string' => '456456', 'firstAlphaNumeric1' => '4', 'firstAlphaNumeric2' => '4', 'firstAlphaNumeric3' => '4', ) array ( 'string' => 'ghijkl', 'firstAlphaNumeric1' => 'g', 'firstAlphaNumeric2' => 'g', 'firstAlphaNumeric3' => 'g', ) array ( 'string' => '!@#$%^&*(', 'firstAlphaNumeric1' => NULL, 'firstAlphaNumeric2' => NULL, 'firstAlphaNumeric3' => NULL, )

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