The key to using GREP in InDesign is being able to define patterns. So, instead of looking for specific text (likeÂ the number 3 or the letterÂ H), you can tell GREP to findÂ any digit or any letter. To find unknown values like these,Â GREPÂ uses something called wildcards.
In this video, I explain how they work in a GREP query and look closer at a few of them. I also discussÂ some GREP queries you already have built right into in InDesign.