What I'm saying is that the pipe (or) "|" is a cheap way to combine regexps. It ... | Hacker News

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		andrewvc on Nov 19, 2014 \| parent \| context \| favorite \| on: Node.js in Flame Graphs What I'm saying is that the pipe (or) "\|" is a cheap way to combine regexps. It has its limitations, but its better than an O(n) search through an array. The regexp parser can create an NFA that is far more optimized.

spion on Nov 19, 2014 [–]

In JS, "far more" isn't quite that dramatically far as in other dynamic language runtimes. See http://jsperf.com/regex-list-vs-full

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