[sr-dev] [kamailio/kamailio] core: allow empty matches (#2869)

[Daniel-Constantin Mierla]

@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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