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@ 2016-07-07T13:48:40Z

<?php

$preg = '\d+(\,\d{3})?(\,\d{3})?(?:\.\d{1,2})?';

$arr = [
  '$5,710.75',
  '$5,710,710.75',
  '$5710.15',
  '$57',
  '$57.1',
  '$57.',
  '$5,7.1',
  '$5,710,710,710.75',
];

foreach ($arr as $str) {
    echo "$str -> ";
    
    $res = preg_match($preg,$a);
    var_dump($res);
}
//

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

34.39 ms | 405 KiB | 5 Q