Jmeter RegEx Extractor

Jmeter RegEx Extractor

I am new to Jmeter's Regular Expression Extractor. For an HTTP Request, I
am getting an HTML Response. I want to extract all the URL strings.
This is one example, the number after tools in the id part changes.
li><a id="link_sub_sub_cat_tools14874187"
href="/EN/shop/tools/tools.cat"
class="cat-/tools/tools"><span>
li><a id="link_sub_sub_cat_tools14874787"
href="/EN/shop/tools/tools.cat"
class="cat-/tools/tools"><span>
li><a id="link_sub_sub_cat_tools14874287"
href="/EN/shop/tools/tools.cat"
class="cat-/tools/tools"><span>
How to do it?