Replace internal use of the magic number -1 with a new constant INDEX_NOT_FOUND. Javadoc changes: Use the active voice "Finds..." (was "Find..."), mention INDEX_NOT_FOUND, and other minor Javadoc nit picking.
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@394613 13f79535-47bb-0310-9956-ffa450edef68
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