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7c95697026
For the case of Clojure and other Lisp syntax highlighting, it is necessary to create huge regexps consisting of hundreds of symbols with the pipe (|) character. To make things more difficult, these Lisp symbols sometimes consists of special characters that are themselves part of special regexp characters like '*'. In addition to being difficult to maintain, it's performance is suboptimal. This patch introduces a new predicate to perform 'source' matching in amortized constant time. This is accomplished by compiling a hash table on the first use.