[Varnish] #1614: Missing support for pcre in substitution string

Varnish varnish-bugs at varnish-cache.org
Tue Oct 21 00:38:29 CEST 2014

#1614: Missing support for pcre in substitution string
 Reporter:  anders  |       Type:  defect
   Status:  new     |   Priority:  normal
Milestone:          |  Component:  varnishd
  Version:  3.0.5   |   Severity:  normal
 Keywords:  pcre    |
 It seems Varnish fails to evaluate PCRE escapes in the substitution
 string. For example if I want to insert odd characters using a hex escape.
 Using Perl from CLI it works (but is displayed oddly as I have a UTF-8

 anders at noname:~$ echo hei | perl -p -e "s@^@\x{e5}@"

 Consider the following VCL:

                 std.log("DEBUG: url is: " + req.url);
                 set req.url = regsub(req.url, "^", "/f\x{e5}");
                 std.log("DEBUG: url is now: " + req.url);

 Then I get:

   854 VCL_Log      c DEBUG: url is: /
   854 VCL_Log      c DEBUG: url is now: /fx{e5}/

 According to http://www.pcre.org/pcre.txt it should work:

 \x{hhh..} character with hex code hhh.. (non-JavaScript mode)

 This is what I need to do when the backend has an odd character in its
 urls. :-)

Ticket URL: <https://www.varnish-cache.org/trac/ticket/1614>
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