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Perl - match and extract from a postcode
Regular Expressions - Extra Elements example from a Well House Consultants training course
More on Regular Expressions - Extra Elements [link]

This example is described in the following article(s):
   • Seven new intermediate Perl examples - [link]

Source code: pcode Module: Q803


=head1 UK Postcode matching in Perl

This is a test bed program to validate UK postcodes
and also to extract the various key elements into
other variables.

The section of a postcode up to the mandatory space
is known as the "in" as it's inbound to a sorting
office, and the section after the space is known as
the "out" as it's used to sort at the sorting office
into individual post staff delivery runs.

I have used the \b boundary condition in this code -
I did NOT want to anchor to start or end of line, but
neither did I want to match postcodes that start within
a word. \b (word boundary match) is a happy compromise.

=cut

while (1) {
print ("please enter delivery postcode: ");
chop ($sendto = <STDIN>);

if ($sendto =~
/\b(([A-Z]{1,2})\d[0-9A-Z]?) +(\d[A-Z]{2})\b/) {
        print "Yay ---- in $1 and out $3 - $2\n";
} else {
        print "OOOOOOps\n";
}
}

__END__

Sample output

Dorothy:p82 grahamellis$ perl pcode
please enter delivery postcode: SN12 7NY
Yay ---- in SN12 and out 7NY - SN
please enter delivery postcode: G51 3AC
Yay ---- in G51 and out 3AC - G
please enter delivery postcode: SW1A 1AA
Yay ---- in SW1A and out 1AA - SW
please enter delivery postcode: RDG1 7NW
OOOOOOps
please enter delivery postcode: RG21 1EE
Yay ---- in RG21 and out 1EE - RG
please enter delivery postcode: ^C
Dorothy:p82 grahamellis$

Learn about this subject
This module and example are covered on our public Regular Expressions course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

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Other Examples
This example comes from our "Regular Expressions - Extra Elements" training module. You'll find a description of the topic and some other closely related examples on the "Regular Expressions - Extra Elements" module index page.

Full description of the source code
The complete training module that describes this source code is availble for download (for limited use) from our download centre.

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