What potential pitfalls should one be aware of when using regular expressions to extract dates from a string in PHP?

When using regular expressions to extract dates from a string in PHP, one potential pitfall to be aware of is that the regular expression may not accurately capture all date formats or may mistakenly match non-date strings. To mitigate this issue, it is important to carefully test the regular expression against various date formats and edge cases to ensure it is capturing the intended dates accurately.

// Sample code snippet to extract dates from a string using a more robust regular expression pattern
$string = "Today is 2022-01-01 and tomorrow is 01/02/2022.";
$pattern = "/\b\d{4}-\d{2}-\d{2}\b|\b\d{2}\/\d{2}\/\d{4}\b/";
preg_match_all($pattern, $string, $matches);

$dates = $matches[0];
print_r($dates);