Filters question in Analytic plz help

I want to track specific urls in a particular sub directory

The patter of the urls is like

myurls_abc1.html
myurls_abc1.html?source=internal
myurls_abc1.html?source=external

I need to track only urls which follow the above pattern.

Which filter should i need to use and how..

Thanks in advance

 

You need to select an advanced include filter and use a regex to include only specific URLs.

 

Thanks

But there is no option like "regex" under

filters-custom filters-advanced

Please reply..