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This paper presents efficient dataflow schemes for parallel string matching. Two subproblems known as the exact matching and the k-mismatches problems are covered. Three parallel algorithms based on multiple input (and output) streams are presented. Time complexities of these parallel algorithms are O((n/d)+/spl alpha/), O/spl les//spl alpha//spl les/m, where n and m represent lengths of reference and pattern strings (n/spl Gt/m) and d represents the number of streams used (the degree of parallelism). We can control the degree of parallelism by using variable number (d) of input (and output) streams. These performances are better than those found in the literature. These algorithms present three different methods to design special purpose systolic array hardware for string matching. With linear systolic array architecture, m PEs are needed for serial design and d*m PEs are needed for parallel design.