The SAP standard report RPR_ABAP_SOURCE_SCAN allows you to search all your ABAP sources for specified keywords or a phrase. You can select reports or packages to search in and choose whether to search commentary, too.
It’s not only handy when you need to find that special line of code, but also if you want to see the usage of certain statements. For example, you can see which and how many reports use “UPDATE”, “DELETE”, etc to update the database.