Clear cache on CodeIgniter using wildcard - codeigniter

Question

CodeIgniter documentation specified only two-ways to delete cache. They are:
$this->cache->delete('cache_item_id')
- for deleting individual cache thru ID
$this->cache->clean()
- for deleting ALL cache
My website have static and dynamic content and I would like to delete all the cache on the latter only.
I'm looking for something like ->delete("latest*") that will delete "latest-video", "latest-video-funny", "latest-video-music", "latest-article", etc.

Answer 1

I think I've got it working, calling $this->cache->cache_info(); will fetch a multidimensional array of all saved cache. The array keys inside the fetch array are the cache_item_id so I can just do the following.
$wildcard = 'latest';
$all_cache = $this->cache->cache_info();
foreach ($all_cache as $cache_id => $cache) :
if (strpos($cache_id, $wildcard) !== false) :
$this->cache->delete($cache_id);
endif;
endforeach;

Answer 2

There is a helper that does this, you can find it here.
how is cache created
$path = $CI->config->item('cache_path');
$cache_path = ($path == '') ? APPPATH.'cache/' : $path;
.
.
.
$uri = $CI->config->item('base_url').
$CI->config->item('index_page').
$CI->uri->uri_string();
$cache_path .= md5($uri);
helper itself
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
if ( ! function_exists('delete_cache'))
{
function delete_cache($uri_string)
{
$CI =& get_instance();
$path = $CI->config->item('cache_path');
$cache_path = ($path == '') ? APPPATH.'cache/' : $path;
$uri = $CI->config->item('base_url').
$CI->config->item('index_page').
$uri_string;
$cache_path .= md5($uri);
if (file_exists($cache_path))
{
return unlink($cache_path);
}
else
{
return TRUE;
}
}
}
all credits go to Steven Benner, his blog.
usage:
delete_cache('/blog/comments/123');