Created attachment 640846 [details]
some 'unescaped left brace in regex' fixes to get rid of perl-5.22 warnings

perl v5.22 introduced the following (taken from perldelta.pod):
===
A literal C<"{"> should now be escaped in a pattern

If you want a literal left curly bracket (also called a left brace)
in a regular expression pattern, you should now escape it by either
preceding it with a backslash (C<"\{">) or enclosing it within square
brackets C<"[{]">, or by using C<\Q>; otherwise a deprecation warning
will be raised.  This was first announced as forthcoming in the v5.16
release; it will allow future extensions to the language to happen.
===

this affects parts of current biblatex-biber, and results, when building with
perl-5.22, in failing test-suite.  i have provided a patch and made a
pull-request on github.com/plk/biber.  for current Publishing:TeXLive/texlive,
would you please consider to integrate the attached patch to biber-1.8 into the
texlive build process.