[regex-coach] alternations working differently in Regex Coach versus perl program.

Maathu Maran mmuthu.maya at gmail.com
Sat Sep 19 08:54:01 UTC 2009 

Hi,

i had been useful in yours information.

Thanks

By,
Muthu


On Fri, Sep 18, 2009 at 2:13 AM, Edi Weitz <edi at agharta.de> wrote:

> Sorry for the delay.  I was on vacation and/or out of town most of the
> time.
>
> Your regex is wrong.  The hyphen is part of one of the alternatives
> (e.g. it's "10" OR "12-[012]..." and so on) which I think is not what
> you want.
>
> The Perl program behaves like the Regex Coach, but you don't see it.
> Try replacing the line 'print "okay\n"' with 'print "okay[$']\n"'
> (note the apostrophe there).
>
> HTH,
> Edi.
>
>
>
> On Sun, Aug 2, 2009 at 8:35 PM, Troy Peterson
> <troypennpeterson at gmail.com> wrote:
> > I am writing a regex to test for valid dates in YYYY-MM-DD format.
> > Using this regex in a perl test program I get positive results for all
> dates
> > for the next 365 days.
> > Regex Coach however failes to match some such as '2010-06-30'.  I assume
> > this is because of the  order of the alternations and the regex wanting
> to
> > match a sub-pattern as quickly as possible.  I can resolve the issue in
> The
> > Regex Coach by adding () around the month and year patterns.
> > I would like to know why there is a difference between my Perl program
> and
> > Regex Coach.  Could this be implementation dependent.  Both
> my program and
> > its output are below.
> > I tend to think that The Regex Coach got this right.
> > (?# regex in The Regex Coach)
> >         [123456789]\d\d\d-                                           #
> year
> >          (?:
> >             (?:0[13578]|10|12 -  [012][123456789]|10|20|30|31)  |      #
> > Months with 31 days
> >             (?:0[469]|11      -  [012][123456789]|10|20|30   )  |      #
> > Months with 30 days
> >             (?:02             -  [012][12345678]||10|20|19   )         #
> > Febuary
> >          )
> > ### perl Test program
> > #!/iw-home/teamsite/iw-perl/bin/iwperl
> > use strict;
> > use warnings;
> > use Carp;
> > use Getopt::Long;
> > use Pod::Usage;
> > use Cwd;
> > use Date::Calc qw(:all);
> > my $dateregex = qr{
> >         [123456789]\d\d\d-                                           #
> year
> >          (?:
> >             (?:0[13578]|10|12 -  [012][123456789]|10|20|30|31)  |      #
> > Months with 31 days
> >             (?:0[469]|11      -  [012][123456789]|10|20|30   )  |      #
> > Months with 30 days
> >             (?:02             -  [012][12345678]||10|20|19   )         #
> > Febuary
> >          )
> > }smx;
> > sub testdate {
> >     my ($d) = (@_);
> >     print "$d";
> >     if ( $d =~ m{$dateregex}smx ) {
> >         print "okay\n";
> >     }
> >     else {
> >         print "\n";
> >         croak "broken";
> >     }
> > }
> > foreach my $d ( 1 .. 365 ) {
> >     my ( $year, $month, $day, $hour, $min, $sec, $doy, $dow, $dst ) =
> >       System_Clock();
> >     ( $year, $month, $day, $hour, $min, $sec ) =
> >       Add_Delta_DHMS( $year, $month, $day, '0', '0', '0', "$d", '0', '0',
> > '0' );
> >     my $td = sprintf( "%4d-%02d-%02d", $year, $month, $day );
> >     testdate("$td");
> > }
> > exit;
> >
> > ##OUTPUT
> > 2009-08-03okay
> > 2009-08-04okay
> > 2009-08-05okay
> > 2009-08-06okay
> > 2009-08-07okay
> > 2009-08-08okay
> > 2009-08-09okay
> > 2009-08-10okay
> > 2009-08-11okay
> > 2009-08-12okay
> > 2009-08-13okay
> > 2009-08-14okay
> > 2009-08-15okay
> > 2009-08-16okay
> > 2009-08-17okay
> > 2009-08-18okay
> > 2009-08-19okay
> > 2009-08-20okay
> > 2009-08-21okay
> > 2009-08-22okay
> > 2009-08-23okay
> > 2009-08-24okay
> > 2009-08-25okay
> > 2009-08-26okay
> > 2009-08-27okay
> > 2009-08-28okay
> > 2009-08-29okay
> > 2009-08-30okay
> > 2009-08-31okay
> > 2009-09-01okay
> > 2009-09-02okay
> > 2009-09-03okay
> > 2009-09-04okay
> > 2009-09-05okay
> > 2009-09-06okay
> > 2009-09-07okay
> > 2009-09-08okay
> > 2009-09-09okay
> > 2009-09-10okay
> > 2009-09-11okay
> > 2009-09-12okay
> > 2009-09-13okay
> > 2009-09-14okay
> > 2009-09-15okay
> > 2009-09-16okay
> > 2009-09-17okay
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> > 2010-08-01okay
> > 2010-08-02okay
> > _______________________________________________
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> >
>
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-- 
Thanks u0026 Regards,

Muthu M. armbpo | T. Nagar | Chennai | India |

"A kind heart is a fountain of gladness, making everything in its vicinity
freshen into smiles."
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