This book constitutes the refereed proceedings of the 14th Annual Symposium on Combinatorial Pattern Matching, CPM 2003, held in Morelia, Michoacan, Mexico in June 2003.; The 28 revised full papers presented were carefully reviewed and selected from 57 submissions.; The papers are devoted to current theoretical and computational aspects of searching and matching strings and more complicate patterns, such as trees, regular expressions, graphs, point sets, and arrays.; Among the application fields addressed are computational biology, bioinformatics, genomics, the Web, data compression, coding, multimedia, information retrieval, pattern recognition, and computer vision.