@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");
```
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