Let's assume your website has "sections" such as money/*, blogs/* etc. You want to have a block visible in that "section" only but exclude certain node pages. Here's the snippet that gets you there:

<?php
$path = drupal_get_path_alias($_GET['q']);
$pages = 'money/*';
$exclude = array('node/6101', 'node/6097');
$page_match = drupal_match_path($path, $pages);
if (!in_array($_GET['q'], $exclude) && $page_match == TRUE) {
return TRUE;
}
return FALSE;
?>

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