[xmlunit/xmlunit.net] f520c4: forgot to port some matchesRegex test

[Stefan B. <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit.net
  Commit: f520c494c95f7293cc01674ce6bbdc0cf923fe64
      https://github.com/xmlunit/xmlunit.net/commit/f520c494c95f7293cc01674ce6bbdc0cf923fe64
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2020-05-09 (Sat, 09 May 2020)

  Changed paths:
    M src/tests/net-placeholders/PlaceholderDifferenceEvaluatorTest.cs

  Log Message:
  -----------
  forgot to port some matchesRegex test