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Under the hood, BPattern builds a pattern AST using the same pattern node classes as the rewrite engine. All the original matching and rewriting machinery is still there — just wrapped in a more approachable, scriptable interface.
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For twenty years, the pattern was predictable and universal. Someone needs information, they open Google, they type a query, they scan through ten blue links, they click a few results, they piece together answers from multiple sources. This process trained us to optimize for that journey. We focused on ranking in those ten blue links because that's where traffic came from. The entire SEO industry built around understanding and exploiting that single funnel.
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」