Another wrench in the works is of course dynamism. Web developers love gratuitous JavaScript which means that any site that loads at least one script could arbitrarily manipulate the underlying HTML document before or during rendering. This is simply the nature of the Web. A different and equally interesting investigation would involve instrumenting a Web renderer to extract actually evaluated regexes, either in JavaScript or through the pattern attribute.
could make sense to first compile a document in compatible mode,
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with type inference [1]. While it would be nice to support,
这些看起来是搬箱子，背后其实是一整套复杂的任务规划与执行。