2

In c-mode, I would like all lines beginning with

exec sql

to have that expression grey and the rest of the line in the default face. How might I achieve that?

2

The following will do something similar to what you asked for.

(let ((re "^[   ]*\\(exec sql\\)\\(.*\\)$"))
    (font-lock-add-keywords 'c-mode `((,re 1 font-lock-preprocessor-face t)))
    (font-lock-add-keywords 'c-mode `((,re 2 font-lock-string-face t))))

The numbers represent subexpression matches, and the t mean that already present fontification should be overridden. Have a look at the documentation of font-lock-keywords.

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