I made this stuff copying from Core's block.module:

//This block will not show pages when these pattern match
$pages = <<< EOT
adsense/*
node/add/*
adsense/*
contact
privacy
tags/*
terms
about
check-for-expired-job
taxonomy/term/*   
EOT;


$pages = drupal_strtolower($pages);
$path = drupal_strtolower(drupal_get_path_alias($_GET['q']));
$hide_block = drupal_match_path($path, $pages);
if ($path != $_GET['q']) {
    $hide_block = $hide_block || drupal_match_path($_GET['q'], $pages);
}
if($hide_block)
{
return $hide_block;
}

//Now do other processing stuff

I made this stuff copying from Core's block.module:

//This block will not show pages when these pattern match
$pages = <<< EOT
adsense/*
node/add/*
adsense/*
contact
privacy
tags/*
terms
about
check-for-expired-job
taxonomy/term/*   
EOT;


$pages = drupal_strtolower($pages);
$path = drupal_strtolower(drupal_get_path_alias($_GET['q']));
$hide_block = drupal_match_path($path, $pages);
if ($path != $_GET['q']) {
    $hide_block = $hide_block || drupal_match_path($_GET['q'], $pages);
}
if($hide_block)
{
return false;
}

//Now do other processing stuff

I think I can use this code from Core's block.module  :

// Match path if necessary.
    if ($block->pages) {
      // Convert path to lowercase. This allows comparison of the same path
      // with different case. Ex: /Page, /page, /PAGE.
      $pages = drupal_strtolower($block->pages);
      if ($block->visibility < BLOCK_VISIBILITY_PHP) {
        // Convert the Drupal path to lowercase
        $path = drupal_strtolower(drupal_get_path_alias($_GET['q']));
        // Compare the lowercase internal and lowercase path alias (if any).
        $page_match = drupal_match_path($path, $pages);
        if ($path != $_GET['q']) {
          $page_match = $page_match || drupal_match_path($_GET['q'], $pages);
        }
        // When $block->visibility has a value of 0 (BLOCK_VISIBILITY_NOTLISTED),
        // the block is displayed on all pages except those listed in $block->pages.
        // When set to 1 (BLOCK_VISIBILITY_LISTED), it is displayed only on those
        // pages listed in $block->pages.
        $page_match = !($block->visibility xor $page_match);
      }
      elseif (module_exists('php')) {
        $page_match = php_eval($block->pages);
      }
      else {
        $page_match = FALSE;
      }
    }

I made this stuff copying from Core's block.module:

//This block will not show pages when these pattern match
$pages = <<< EOT
adsense/*
node/add/*
adsense/*
contact
privacy
tags/*
terms
about
check-for-expired-job
taxonomy/term/*   
EOT;


$pages = drupal_strtolower($pages);
$path = drupal_strtolower(drupal_get_path_alias($_GET['q']));
$hide_block = drupal_match_path($path, $pages);
if ($path != $_GET['q']) {
    $hide_block = $hide_block || drupal_match_path($_GET['q'], $pages);
}
if($hide_block)
{
return $hide_block;
}

//Now do other processing stuff