# Exclude Changes From Outside Java Pattern Changes can be filtered to not trigger a build if none of the files within a change match the Java patterns (regular expression) listed. ![Exclude Changes From Outside Java Pattern](images/pollbuildfilterexcjavapattern.png) **For example, with the following regular expressions:** `//depot/main/tests.*` `//depot/main/src/.*\.cpp` `//depot/main/build/.*(?:\.rb|\.py|\.bat|Jenkinsfile)` `//depot/main/lib/(?!Lib1|Lib2).*` - The change below is not filtered because these files match the pattern on `tests.*`: `//depot/main/tests/CONTRIUBTING.md` `//depot/main/tests/001/index.xml` - This change below is not filtered because the file matches the pattern on `tests.*` which was probably intended to describe the `tests/` directory. This is an example as to why you should be careful when using incomplete file paths. `//depot/main/tests.doc` - The change below is not filtered because all of the files match the pattern looking for script files in `build/`: `//depot/main/build/rbs/deploy_server.rb` `//depot/main/build/deploy/deploy.bat` `//depot/main/build/Jenkinsfile` - The change below is filtered because none of the files match the pattern looking for `.cpp` files under `main/src`: `//depot/main/src/howto.doc` `//depot/main/src/oldmain.c` `//depot/main/src/art/splash.bmp` `//depot/main/src/bt/funnelcake.php` - The change below is filtered because `Lib1` is included in a negative lookahead, and is excluded: `//depot/main/lib/Lib1/build.xml` Click the browser **Back** button to go back to the previous page.