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std::regex doesn't support the Perl mode modifiers such as (?i). It is,
in fact, a valid RE.

http://www.boost.org/doc/libs/1_57_0/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html
describes how  the"Perl regular expression syntax is based on that used
by the programming language Perl . Perl regular expressions are the
default behavior in Boost.Regex". However, by contrast,
http://www.cplusplus.com/reference/regex/regex_constants/#syntax_option_type
lists only ECMAScript, basic, extended, awk, grep, and egrep-type REs,
of which ECMAScript has been chosen as default.

http://www.regular-expressions.info/stdregex.html summarize the
differences between these RE syntaxes; none of them, however, support
the Perl-inspired case insensitivity mode modifiers such as LoRenZo
uses. http://www.regular-expressions.info/javascript.html in particular
notes that the syntax which std::regex implements by default,
"JavaScript implements Perl-style regular expressions. However, it lacks
quite a number of advanced features available in Perl and other modern
regular expression flavors" such as "mode modifiers to set matching
options within the regular expression".

It looks like if one wants to keep allowing (?i) and similar mode
modifiers -- and convenient case insensitivity is pretty useful -- then
reverting to boost::regex would make sense.

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https://bugs.launchpad.net/bugs/1414362

Title:
  Regex defined for ADL Search does not work with v0.850

Status in DC++:
  New

Bug description:
  The Regex definitions that I was using with 0.843 not seem to work with 0.850.
  The System Log displays error messages such as the below:

  Invalid regular expression: (?i)(?=.*?.flac.)

  I believe this also forces the client to use extremely high memory
  allocation when opening very large file lists, which I have never
  experienced before.

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