Theme files search function… plugin recommendation?

i’m sick and tired of having to open up dreamweaver whenever i want to search for a line of code within all the files that comprise a theme i’m using. is there a plugin that anyone recommends (or just a more efficient way to do this) so that I can search for a line of code within all my theme files without having to leave the wordpress dashboard? preferably when i’m already in the Appearance>Editor area?

I’ve searched through the plugins repository but didn’t find any plugins that indicated they can do this.

please advise. thanks in advance!