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<?php var_dump(preg_replace('#(http|https):\/\/([.a-zA-Z0-9]*)mailjet\.([\S]*)#', '//$2mailjet.$3', 'http://test.mailjet.com/?url=http://example.mailjet.com'));
Output for 5.6.38, 7.1.0 - 7.1.25, 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
string(50) "//test.mailjet.com/?url=http://example.mailjet.com"
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 string(50) "//test.mailjet.com/?url=http://example.mailjet.com"

preferences:
138.54 ms | 402 KiB | 178 Q