Mike Cardwell wrote:
> On 02/10/12 11:24, John Horne wrote:
>
> > I am trying to do a 'match' of one variable against another:
> >
> > ${if match {$h_X-UoP-Loop:} {^$sender_address } }
> > the sender address may well contain '.', which as a regex
> > will match any character. So my question is whether there is any
> > function to escape characters such as '.' so that they can then be
> > used correctly in a regex?
>
> In perl style regular expressions, \Q disables pattern meta-characters
> until \E is reached.
But Exim uses PCRE. From `man pcrepattern`:
If you want to remove the special meaning from a sequence of charac-
ters, you can do so by putting them between \Q and \E. This is differ-
ent from Perl in that $ and @ are handled as literals in \Q...\E
sequences in PCRE, whereas in Perl, $ and @ cause variable interpola-
tion. Note the following examples:
Pattern PCRE matches Perl matches
\Qabc$xyz\E abc$xyz abc followed by the
contents of $xyz
