I would like to be able to use RegEx in my AppLogs searches. For example, I need to create an alert based on the occurrence of "[error]" in my logs, but AppLogs search throws out the special characters and returns all instances of "error".
Another example is case-sensitive searching. RegEx would allow us to use this (or not) whenever we want. I could search for "FooBar" and exclude "foobar", etc.
There are many, many powerful use cases for RegEx that would really expand the AppLog searching capabilities, using an already-established standard that is common elsewhere.