An apparatus, a carrier medium carrying computer readable code to implement a method, and a method for searching for a plurality of patterns definable by complex expressions, and further, for efficiently generating data for such searching. One method includes accepting or determining a plurality of state machines for searching for a plurality of patterns, merging the state machines to form a merged state machine, and storing a data structure describing the merged state machine, including state data on the states of the merged state machine. The method is such that pattern matching logic reading state data and accepting a sequence of inputs can search the input sequence for the plurality of patterns.

 
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