Post-X - Grammar language

Post-X is a grammar language created in 1980 by P.A.C. Bailes and L.H. Reeker.

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The Post-X language is designed to provide facilities for pattern-directed processing of strings, sequences and trees in an integrated applicative format.

Post-X first developed in University of Queensland
Post-X on HOPL
Read more about Post-X on Semantic Scholar: 1.
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Example from the web:

REPLACE GRAM := "<"^BREAK">"^"> ''
                {$<^((REPLACE GRAM)<
                   SELECT RHS
                   (ALT LTST<
                   (LHS--FIND $2 <GRAM)))
                %>}
                INULL{$$};