PHP has built-in functions for validating regular expressions using the preg_match function. This function takes two arguments - the regex pattern to validate and the string to validate against.
In this example, we have a regex pattern that allows alphanumeric characters, underscores, and hyphens with a minimum length of 3 and a maximum length of 16. We then use the preg_match function to validate the $username variable against this pattern.
The package library for this function is the PCRE (Perl Compatible Regular Expressions) library, which is included in PHP by default.
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