Failiure to validate simple expresison

[micrenda]

Hello

I have this dimple peg grammar:

STRING_ESCAPE_SEQ               <-  '\\\''  / '\\\\' / '\\0' / '\\b' / '\\n' / '\\r' / '\\t' / '\\f' / ( '\\' 'u' HEX_DIGIT{4} ) / ( '\\' 'U' HEX_DIGIT{8} )

HEX_DIGIT           <- [0-9A-Fa-f]

When I try to validate a simple file I get this message:

1:104: syntax error
error loading grammar

PEG Playground has no problem with this grammar and can validate the string without problems.

[mqnc]

Omg sorry, I didn't see this...
Peglib has evolved a lot since I've last updated this project, I think it just doesn't support some of the newer features.
I want to get back to this and also speed up the UI.