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run code in 300+ PHP versions simultaneously
<?php $str = "ab9c5lek94ke2koe8nsk9"; echo preg_replace('/(\d)([^\d]*)(\d)([^\d]*)(\d)([^\d]*)$/',"<b>$1</b>$2<b>$3</b>$4<b>$5</b>$6",$str);
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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
ab9c5lek94ke<b>2</b>koe<b>8</b>nsk<b>9</b>
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 ab9c5lek94ke<b>2</b>koe<b>8</b>nsk<b>9</b>

preferences:
153.5 ms | 402 KiB | 178 Q