In what situations should a regex pattern be adjusted to improve the accuracy of preg_match_all results in PHP?

When the preg_match_all function in PHP is not returning the expected results, it may be necessary to adjust the regex pattern to improve accuracy. This can be done by refining the pattern to better match the specific text or format being searched for. Common adjustments include adding or removing certain characters, using quantifiers more effectively, or incorporating lookaheads or lookbehinds to target specific patterns within the text.

$text = "The quick brown fox jumps over the lazy dog.";
$pattern = '/\b\w{4,}\b/'; // Adjusted regex pattern to match words with 4 or more characters

preg_match_all($pattern, $text, $matches);

print_r($matches[0]);