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Communications of the ACM

Communications of the ACM

A theory of discrete patterns and their implementation in SNOBOL4

The notion of a discrete pattern is formalized and certain properties deduced. A pattern is shown to be a generalization of a formal language. Algorithms for implementing the kinds of patterns in SNOBOL4 are given. The general approach is to create, in-so-far as possible, a bottom-up parse from a top-down specification.

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