3v4l.org

run code in 300+ PHP versions simultaneously
<?php $re = '/(?:"\K([^_\r\n]+)|\G(?!^))(?=[^":\r\n]*")(?=[^:\r\n]*:)_?([a-zA-Z])([^"_\r\n]*)/'; $str = '"aa_bb" : "foo" "pp_Qq" : "bar" "Xx_yY_zz" : "foobar" "Xx_yYyyyyyYyY_zz_a" : "foobar"'; $result = preg_replace_callback($re, function($matches) { return strtolower($matches[1]) . strtoupper($matches[2]) . strtolower($matches[3]); }, $str); echo $result;
Output for 7.1.0 - 7.1.33, 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
"aaBb" : "foo" "ppQq" : "bar" "xxYyZz" : "foobar" "xxYyyyyyyyyyZzA" : "foobar"
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 "aaBb" : "foo" "ppQq" : "bar" "xxYyZz" : "foobar" "xxYyyyyyyyyyZzA" : "foobar"
preferences:
144.62 ms | 402 KiB | 212 Q