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dns: tweak regex for IPv6 addresses

Rodrigo Muino Tomonari requested to merge github/fork/lpinca/use/non-capturing-group into master
Checklist
  • make -j4 test (UNIX), or vcbuild test nosign (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines
Affected core subsystem(s)

dns

Description of change

The regex used in dns.setServers() to match IPv6 addresses in square brackets uses a capturing group for the port but this info is not needed.

This commit replaces the capturing group with a non capturing one.

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