pkgsrc/devel/ragel/DESCR

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Ragel compiles finite state machines from regular languages into
executable C, C++, Objective-C, D, Java, or Ruby code. Ragel state
machines can not only recognize byte sequences as regular expression
machines do, but can also execute code at arbitrary points in the
recognition of a regular language. Code embedding is done using
inline operators that do not disrupt the regular language syntax.