Steps: 1. Add custom pattern (via IndexPatternProvider implementation), for example

author\s+(\S+)

2. Try to search by this pattern in file contaninig code fragment

/** * @author yole */

Expression "(IndexPatternSearch.getOccurrencesCount(file, pattern) > 0)" will be true, but "IndexPatternSearch.search(file, codeLinkType).findAll()" will return empty collection For comment

/* * @author yole */

same collection will contain single element.