ereg functions where not replaced in core D6 though they were deprecated, and now removed.
The reason was that this would break theAPI file_scan_directory() called from other modules.
Thhe proposed fix is here
https://www.drupal.org/node/360605#comment-1399150
In file.inc, function they propose this:
function file_scan_directory($dir, $mask, $nomask = array('.', '..', 'CVS'), $callback = 0, $recurse = TRUE, $key = 'filename', $min_depth = 0, $depth = 0) {
...
- elseif ($depth >= $min_depth && ereg($mask, $file)) {
+ elseif ($depth >= $min_depth && preg_match($mask, $file)) {
which actually break all calls to this function, having to add "/" delimiters. Example:
function drupal_clear_js_cache() {
- file_scan_directory(file_create_path('js'), '.*', array('.', '..', 'CVS'), 'file_delete', TRUE);
+ file_scan_directory(file_create_path('js'), '/.*/', array('.', '..', 'CVS'), 'file_delete', TRUE);
variable_set('javascript_parsed', array());
}
I just change that to
elseif ($depth >= $min_depth && preg_match('#' . $mask . '#' , $file)) {
Which is all compatible.
(note the "#" instead of "/" which causes a log error "Warning: preg_match(): Compilation failed: a numbered reference must not be zero at offset 1 in file_scan_directory()" when the string includes a "/")
