Add icons to wp_list_categories

Today when I need to add icons to wp_list_categories, the post from Isabel Castillo showed up in the Google search results, which gave me the idea that wp_list_categories filter could do the magic.

The only problem is for some reason, I need the icon displayed in the a tag, the pattern from Castillo’s post didn’t work for me.

I’m really suck at Regular Expression, it took me some time to figure it out:

The $pattern means “find the start a tag for me”, and the $1 in the $replacement means “leave the a tag you found here”, so we could append the icon (css with background image / web font, or simply a gif / png).

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