(mongodb >=1.0.0)
MongoDB\BSON\Regex::getPattern — Returns the Regex's pattern
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Returns the Regex's pattern.
Example #1 MongoDB\BSON\Regex::getPattern() example
<?php
$regex = new MongoDB\BSON\Regex('regex', 'i');
var_dump($regex->getPattern());
?>
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string(5) "regex"