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[Attribute] deployIgnore [Description] 
A regular expression defining paths to ignore when autoDeploy and deployOnStartup are set. This allows you to keep your configuration in a version control system, for example, and not deploy a .svn or CVS folder that happens to be in the appBase. This regular expression is relative to appBase. It is also anchored, meaning the match is performed against the entire file/directory name. So, foo matches only a file or directory named foo but not foo.war, foobar, or myfooapp. To match anything with "foo", you could use .*foo.*. See Automatic Application Deployment for more information.
Apache Tomcat Configuration Reference (6.0.39) - The Host Container
Description