[pcre-dev] [Bug 2673] New: Regex cannot be compiled if sourc…

https://bugs.exim.org/show_bug.cgi?id=2673

            Bug ID: 2673
           Summary: Regex cannot be compiled if source compiled with
                    std=c18
           Product: PCRE
           Version: 10.33 (PCRE2)
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Code
          Assignee: Philip.Hazel@???
          Reporter: shiftag@???
                CC: pcre-dev@???

Hi,

I'm using a regex that do not work if I compile with the latest C version
(c18). I used the following example:

http://pcre.org/current/doc/html/pcre2demo.html

With the following regex:

"^((?<scheme>[^:/?#]+):)?(?<authority>//(((?<userinfo>[^/?#]*)@)?(?<host>[^/?#:]*)(?:(?<port>[^/?#]*))?))?(?<path>[^?#]*)(\?(?<query>[^#]*))?(#(?<fragment>.*))?"

If compiled with gnu11 I modified the regex as below:

static const char pattern[] =
R"("^((?<scheme>[^:/?#]+):)?(?<authority>//(((?<userinfo>[^/?#]*)@)?(?<host>[^/?#:]*)(?:(?<port>[^/?#]*))?))?(?<path>[^?#]*)(\?(?<query>[^#]*))?(#(?<fragment>.*))?)";

( R"()" ) <- for raw string.

And then I build the source:

$ gcc test.c `pkg-config --libs --cflags libpcre2-8` -o test

Everything works fine.

But when using c18 as below I got an error for the exact same regex:

static const char pattern[] =
"^((?<scheme>[^:/?#]+):)?(?<authority>//(((?<userinfo>[^/?#]*)@)?(?<host>[^/?#:]*)(?:(?<port>[^/?#]*))?))?(?<path>[^?#]*)(\?(?<query>[^#]*))?(#(?<fragment>.*))?";

$ gcc -std=c18 test.c `pkg-config --libs --cflags libpcre2-8` -o test
$ ./test
PCRE2 compilation failed at offset 122: assertion expected after (?( or (?(?C)

is there any workaround ?

Thx

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