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@ 2017-07-08T13:49:27Z

<?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
Performance
VLD
References
Branches

print_r: documentation ( source)
preg_grep: documentation ( source)

preferences:dark modelive preview

32.76 ms | 402 KiB | 5 Q