On Monday, March 10, 2014 12:09:22 PM UTC-5, Joachim Schrod wrote:
>
> On 03/10/14 15:37, Matt Zagrabelny wrote:
> > On Sun, Mar 9, 2014 at 5:58 PM, Teoh khah swee
> > <ks.t...@gmail.com<javascript:>>
> wrote:
> >> HI all,
> >>
> >> I just come across an case statement for puppet. I would like to know
> what
> >> the means of the mx for below sample code?
> >>
> >> case $::operatingsystem {
> >> /(?-mx:AIX)/ :{
> >
> > From:
> >
> > http://perldoc.perl.org/perlre.html
> >
> > (?adlupimsx-imsx)
> > (?^alupimsx)
> > One or more embedded pattern-match modifiers, to be turned on (or
> > turned off, if preceded by - ) for the remainder of the pattern or the
> > remainder of the enclosing pattern group (if any).
> >
> > (?adluimsx-imsx:pattern)
> >
> > m:
> > Treat string as multiple lines. That is, change "^" and "$" from
> > matching the start or end of line only at the left and right ends of
> > the string to matching them anywhere within the string.
> >
> > x:
> > Extend your pattern's legibility by permitting whitespace and comments.
> >
> > I would then say that puppet is looking for AIX without capturing it
> > and has turned off the m and x options for this pattern match.
>
> I don't know if Ruby regexps are really exactly the same as Perl
> regexps, but, to me as a Perl programmer, this regexp looks
> semantically identical to /AIX/, just with some added garbage to
> irritate people who don't know enough about regexps... ;-)
>
>
There's no need to speculate about Perl vs. Ruby (vs. Puppet) regexes, when
instead we can go straight to the docs:
http://docs.puppetlabs.com/puppet/3/reference/lang_datatypes.html#regular-expressions.
We see there that Puppet accepts options m, x, and i, which have the same
meaning to Puppet as to Ruby and Perl (multiline mode, (in)significant
whitespace/comment mode, and case-insensitive mode, respectively).
Since all these options are off by default, Joachim is right: the regex
presented means exactly the same thing as /AIX/, and explicitly declaring
the options off does nothing but obfuscate.
John
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