You might want to have a look at nedit. It has reasonably powerful syntax highlighting based on what seem to be Perl regexen. IIRC, features like look-arounds are supported. I've not tried to set up highlighting for a new language but I would have thought it was possible.

Cheers,

JohnGG

In reply to Re^3: Source editor w/highlighting for Perl 6 ? by johngg
in thread Source editor w/highlighting for Perl 6 ? by John M. Dlugosz

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