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@ 2017-07-09T01:34:02Z

<?php
$in='Av. St.joan 121';
if(preg_match('/[A-Z][^A-Z]*[A-Z]/',$in)){
    echo 'invalid';
}else{
    echo 'valid';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

55.62 ms | 402 KiB | 5 Q