Support lookbehind in terminal tokens

eclipse-langium / langium

Next-gen language engineering / DSL framework

https://langium.org/

MIT License

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Support lookbehind in terminal tokens #1355

Closed msujew closed 4 months ago

msujew commented 5 months ago

The regex standard allows for positive/negative lookbehind in terminal tokens. Currently, this is unsupported in Chevrotain, but we can enable support for it similar to how we support unicode terminals.