PHP Detecting Zip Codes In Strings – String Function

<?php
function detect_zipcode($string) {
    return preg_match('/\b\d{5}(-\d{4})?\b/', $string);
}echo '<pre>';if (detect_zipcode('MD  11101-3883')) {
    echo "Test 1: true\n";
}if (detect_zipcode('The zipcode 26623 is the area in which I grew up.')) {
    echo "Test 2: true\n";
}
if (detect_zipcode('The Phone Number is 301-555-1212')) {
    echo "Test 3: true\n";
}
if (detect_zipcode('426969-313109')) {
    echo "Test 4: true\n";
}echo '

‘;
?>

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