# 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`

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