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<?php $re = '%^ ((?=x))? ((?=y))? (\w) $%mx'; $str = 'x y z'; preg_match_all($re, $str, $matches, PREG_SET_ORDER | PREG_UNMATCHED_AS_NULL, 0); // Print the entire match result var_dump($matches);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
array(3) { [0]=> array(4) { [0]=> string(1) "x" [1]=> string(0) "" [2]=> NULL [3]=> string(1) "x" } [1]=> array(4) { [0]=> string(1) "y" [1]=> NULL [2]=> string(0) "" [3]=> string(1) "y" } [2]=> array(4) { [0]=> string(1) "z" [1]=> NULL [2]=> NULL [3]=> string(1) "z" } }
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.1.0 - 7.1.33
Notice: Use of undefined constant PREG_UNMATCHED_AS_NULL - assumed 'PREG_UNMATCHED_AS_NULL' in /in/bu1Sf on line 13 Warning: A non-numeric value encountered in /in/bu1Sf on line 13 array(3) { [0]=> array(4) { [0]=> string(1) "x" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "x" } [1]=> array(4) { [0]=> string(1) "y" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "y" } [2]=> array(4) { [0]=> string(1) "z" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "z" } }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Notice: Use of undefined constant PREG_UNMATCHED_AS_NULL - assumed 'PREG_UNMATCHED_AS_NULL' in /in/bu1Sf on line 13 array(3) { [0]=> array(4) { [0]=> string(1) "x" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "x" } [1]=> array(4) { [0]=> string(1) "y" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "y" } [2]=> array(4) { [0]=> string(1) "z" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(1) "z" } }
preferences:
207.64 ms | 412 KiB | 5 Q