Thanks for your detailed response.

In fact, it looks like a string is a constant element in the grammar of 
Coccinelle.
Thus, we can change a string "aaa" to a string "bbb", but there is no way
to "look inside the literal" and make transformations there from SmPL alone.

Would it make sense to peek into strings and source code comments by the semantic patch language?

Would it be convenient and safer to avoid calls into SmPL's scripting 
interfaces?

Regards,
Markus
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