HEADSUP: regsub() changes in -trunk

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Jun 20 14:30:49 CEST 2008

Those of you running -trunk should take note of this commit if
you use regsub() in your VCL.

I apologize for this kind of disruptive change, but the replacement
syntax was badly chosen and I needed to fix it before 2.0


Author: phk
Date: 2008-06-20 13:58:25 +0200 (Fri, 20 Jun 2008)
New Revision: 2741



Make an executive decision, and change the regsub() replacement specifiers to
get something which is consistent and nontroubling for URL and query strings.

Since $ and & both are heavily used in query strings, we (DES & I)
have chosen to use \0 ... \9 for replacement indicators, with \0
being the "all matched text" replacement and \1...\9 replacing
with tne N'th paranthesized subexpressions.

   regsub("_barf_", "(b)(a)(r)(f)", "\0\4\3\2\\p") -> "_barffra\p_"


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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