@btriller - looking again at this one, wouldn't it be the same to do:

subst_hf("X-My-Header", "/^(.+)$/prefix \1/", "a");
subst_hf("X-My-Header", "/^(.+)$/\1 suffix/", "a");

instead of:

subst_hf("X-My-Header", "/^/prefix /", "a");
subst_hf("X-My-Header", "/$/ suffix/", "a");

Knowing that

% echo blub|sed 's/^/prefix /'
prefix blub
% echo blub|sed 's/$/ suffix/'
blub suffix

works, it felt weird to write

subst_hf("X-My-Header", "/^(.)/prefix \1/", "a");
subst_hf("X-My-Header", "/(.)$/\1 suffix/", "a");

As most of the time, there are other ways to do it (above suggested or remove_hf(), looping over all headers and append_hf()).
I understand the concerns, so I don't mind if the PR is closed.

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