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<?php $strings = [ 'av. St Joan 128', 'Av. st joan 122', 'av. St joan 212', 'Av. St.joan 121', 'AV. st joan 232' ]; $results = preg_grep('~^[^A-Z]*[A-Z]?[^A-Z]*$~', $strings); print_r($results);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [1] => Av. st joan 122 [2] => av. St joan 212 )
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 Array ( [1] => Av. st joan 122 [2] => av. St joan 212 )

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207.56 ms | 402 KiB | 291 Q