Anchors like ^ and $ match beginning resp. ending of strings but their
matches are zero length, which is ok.
The anchors can be used to pre-/append a prefix/suffix via e.g.
subst_hf("X-My-Header", "/^/prefix /", "a");
subst_hf("X-My-Header", "/$/ suffix/", "a");

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue #XXXX (replace XXXX with an open issue number)

Description

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2869

Commit Summary

• core: allow empty matches

File Changes

• M src/core/data_lump.c (2)
• M src/core/re.c (4)

Patch Links:

• https://github.com/kamailio/kamailio/pull/2869.patch
• https://github.com/kamailio/kamailio/pull/2869.diff

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