If set, and Jenkins is set to poll for changes, Jenkins will ignore any files and/or folders in this list when determining if a build needs to be triggered.

Each exclusion uses regular expression pattern matching, and must be separated by a new line.

Each pattern is matched against the entire Subversion path of the changed file (Java Matcher.matches()), not as a substring search. A relative path such as src/main/web/.*\.html will not match /trunk/myapp/src/main/web/index.html. Write a pattern that covers the whole path, for example /trunk/myapp/src/main/web/.*\.html or .*/src/main/web/.*\.html.

	/trunk/myapp/src/main/web/.*\.html
	/trunk/myapp/src/main/web/.*\.jpeg
	/trunk/myapp/src/main/web/.*\.gif
  

The example above illustrates that if only html/jpeg/gif files have been committed to the SCM a build will not occur.

More information on regular expressions can be found here.