So, following work on RegExp.escape [1] I found out that implementations may extend the regular expression grammar in JavaScript [2]. However, when asking esdiscuss and Stack Overflow about it [2][3] it doesn't look like any implementations currently do so (*).
Can we please forbid implementations from extending the regular expression syntax? It seems like this could cause compatibility issues between implementations anyway. We have subclassable RegExp with hooks and symbols in place and implementations that want to provide an extended RegExp can subclass RegExp or propose an extension to the language itself. [1] https://github.com/benjamingr/RegExp.escape [2] https://esdiscuss.org/topic/why-are-implementations-allowed-to-extend-the-regular-expressions-syntax [3] http://stackoverflow.com/questions/30958288/what-ecmascript-implementations-extend-the-regexp-syntax (*) some did it to implement ES2015 features before ES2015.
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