apkdetails | Analyzes an APK and prints information helpful | 3D Printing library

I'm setting up a function where I collect a list of apk files, then inside a For-loop, I declare a ZipFile intense to check the ABI Directories under the lib folder, by checking if any file ends with ".so". The only option I can solution I can think of is to use regex String expressions

I've made several regex expression attempts with \b, [A-Za-z-0-9]*, but I keep getting NullPointerException. I researched solutions for using regex with File names, but not really cases for ZipFile and ZipEntry classes. At the moment, here is my current approach with Regex. (Sometimes the regex expressions make my head spin.)