How can RegexIterator be effectively used in PHP to filter out specific files or folders during a recursive iteration process?

When using RecursiveDirectoryIterator in PHP to iterate over files and folders recursively, you may want to filter out specific files or folders based on a regular expression pattern. This can be achieved by using RegexIterator along with RecursiveIteratorIterator to apply the regex filter during the iteration process. 

$directory = new RecursiveDirectoryIterator('/path/to/directory');
$iterator = new RecursiveIteratorIterator($directory);
$regexIterator = new RegexIterator($iterator, '/pattern_to_match/', RegexIterator::MATCH);

foreach ($regexIterator as $file) {
    echo $file->getPathname() . PHP_EOL;
}

Keywords

RegexIterator PHP filter specific files recursive iteration

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