The papers contained in this volume were presented at theFourth Annual Symposium on Combinatorial Pattern Matching,held in Padova, Italy, in June 1993.Combinatorial pattern matching addresses issues of searchingand matching of strings and more complicated patterns suchas trees, regular expressions, extended expressions, etc.

A linear time pattern matching algorithm between a string and a tree.- Tight comparison bounds for the string prefix-matching problem.- 3-D docking of protein molecules.- Minimal separators of two words.- Covering a string.- On the worst-case behaviour of some approximation algorithms for the shortest common supersequence of k strings.- An algorithm for locating non-overlapping regions of maximum alignment score.- Exact and approximation algorithms for the inversion distance between two chromosomes.- The maximum weight trace problem in multiple sequence alignment.- An algorithm for approximate tandem repeats.- Two dimensional pattern matching in a digitized image.- Analysis of a string edit problem in a probabilistic framework.- Detecting false matches in string matching algorithms.- On suboptimal alignments of biological sequences.- A fast filtration algorithm for the substring matching problem.- A unifying look at d-dimensional periodicities and space coverings.- Approximate string-matching over suffix trees.- Multiple sequence comparison and n-dimensional image reconstruction.- A new editing based distance between unordered labeled trees.

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