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Subject: case-insensitive regexp in derived-mode
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Following this tutorial
http://ergoemacs.org/emacs/elisp_syntax_coloring.html

Now my keywords are working, but the regexp to colour keyword is case insensitive.

I was able to get it to work by evaluating
(setq font-lock-keywords-case-fold-search t) 
after loading the custom mode into that buffer.

However no matter where I put it in the .el file of the custom mode, I cannot to work automatically.

The documentation also says "You can use case-fold in font-lock-defaults to specify the value of font-lock-keywords-case-fold-search which says whether search-based fontification should be case-insensitive."

any help would be great, thanks.