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<?php // Test if string matches if (preg_match("/^\d{5}$/", $zipCode)) { echo "Valid zip"; } // Capture groups $pattern = "/^(\d{4})-(\d{2})-(\d{2})$/"; if (preg_match($pattern, "2024-06-15", $matches)) { echo $matches[0]; // "2024-06-15" (full match) echo $matches[1]; // "2024" (group 1) echo $matches[2]; // "06" echo $matches[3]; // "15" }
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