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run code in 300+ PHP versions simultaneously
<?php $c = " total used free shared buffers cached\nMem: 494 383 111 0 29 200\n-/+ buffers/cache: 153 341\nSwap: 255 0 255"; preg_match("Mem:\s+(?<total>\d+)", $c ,$r); print_r($r);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Delimiter must not be alphanumeric, backslash, or NUL in /in/eKJjD on line 4

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