Look-behind proposal in trouble

Yang Guo yangguo at chromium.org
Thu Nov 19 08:04:41 UTC 2015

The experimental implementation [0] in V8 landed a few days ago and is
included in the latest Canary build (49.0.2568.0 and later).
You can test it after enabling it with the command line flag
Apparently the port to SpiderMonkey is already underway [1].

This implementation supports variable length lookbehind similar to .NET's
semantics. It does so by emitting code to read backwards inside the
lookbehind. The size of the change without platform ports and tests is
about 600 lines.

[0] https://codereview.chromium.org/1418963009/
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1225665
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