he/him 
TIL in Web ECMAScript. Has the potential to be a memory leak in a very rare scenario.pic.twitter.com/BORGQQQMhA
@sebmck Used too much hyperbole with "very rare". Something to keep in mind if you're matching large strings as they'll be kept around.
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@sebmck don't suppose you know of a functional regex parser that does not have all the side effects of the stateful, native RegExp? -
@hurricanejames Not really. Performance would be terrible as native regexes are extremely performant and optimised. - 1 more reply
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@sebmck Thought it can hold only the last nine captured groups? -
@grabbou There's RegExp.lastMatch and RegExp["$&"] too. - 1 more reply
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@sebmck more like security leak!Thanks. Twitter will use this to make your timeline better. UndoUndo
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@sebmck It's not the worst thing: `var s = hugeString.slice(0, 1)` keeps entire `hugeString` in memory until `s` is released in V8. -
@sebmck Even more fun when you reuse some single small node from an old AST in new one, but entire 2 MB source is retained in RAM.
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@sebmck and don't forget RegExp['$&'] that will always keep pthe whole string in ^_^Thanks. Twitter will use this to make your timeline better. UndoUndo
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