[OpenSIPS-Devel] [OpenSIPS/opensips] dfd795: pvars: fix incorrect mathching for "" strings

[Razvan Crainea]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: dfd795feafa3229eee32144b3b2a42a0bd4c74ee
      https://github.com/OpenSIPS/opensips/commit/dfd795feafa3229eee32144b3b2a42a0bd4c74ee
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2018-10-03 (Wed, 03 Oct 2018)

  Changed paths:
    M route.c

  Log Message:
  -----------
  pvars: fix incorrect mathching for "" strings

Before this fix, opensips was reporting `"" !~ "[123]"` as `false`,
which is incorrect. On the other side, `"" =~ "[123]"` is reported on
`false` too, but this is correct. This commit makes the NULL and
0-lenght strings matching more consistent.

Kudos to Liviu Chircu for brainstorming this issue.



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