What I always do is, I search the files…
So I use the “Search in files”-function in Notepad++ (which I am using) and limit the search to the directory, where I think, I will find what I am looking for.
So, probably, you know already the plugins directory. You enter this information into the folder input line e.g.:
c:/xampp/htdocs/wordpress/wp-content/plugins/plugin-with-sortcode/
When I am looking for a function I search
function NameOfFunction(
Shouldn’t I find it, I try sometimes without the function
part.
You are searching for a shortcode, you could try things like
add_shortcode( 'nameOfshortcode'
add_shortcode('nameOfshortcode'
add_shortcode( "nameOfshortcode"
You see, I alter the quotation marks as well as the spaces. If the first doesn’t work maybe the second or the third spelling.
Hope this helps.