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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 git.master, git.master_jit, rfc.property-hooks
Array ( [1] => Av. st joan 122 [2] => av. St joan 212 )

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