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Man Pages


Manual Reference Pages  -  TIE::HASH::REGEX (3)

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NAME

Tie::Hash::Regex - Match hash keys using Regular Expressions

CONTENTS

SYNOPSIS



  use Tie::Hash::Regex;
  my %h;

  tie %h, Tie::Hash::Regex;

  $h{key}   = value;
  $h{key2}  = another value;
  $h{stuff} = something else;

  print $h{key};  # prints value
  print $h{2};    # prints another value
  print $h{^s}; # prints something else

  print tied(%h)->FETCH(k); # prints value and another value

  delete $h{k};   # deletes $h{key} and $h{key2};



or (new! improved!)



  my $h : Regex;



DESCRIPTION

Someone asked on Perlmonks if a hash could do fuzzy matches on keys - this is the result.

If there’s no exact match on the key that you pass to the hash, then the key is treated as a regex and the first matching key is returned. You can force it to leap straight into the regex checking by passing a qr’ed regex into the hash like this:



  my $val = $h{qr/key/};



exists and delete also do regex matching. In the case of delete all vlaues matching your regex key will be deleted from the hash.

One slightly strange thing. Obviously if you give a hash a regex key, then it’s possible that more than one key will match (consider c<$h{qw/./}>). It might be nice to be able to do stuff like:



  my @vals = $h{$pat};



to get all matching values back. Unfortuately, Perl knows that a given hash key can only ever return one value and so forces scalar context on the FETCH call when using the tied interface. You can get round this using the slightly less readable:



  my @vals = tied(%h)->FETCH($pat);



    ATTRIBUTE INTERFACE

From version 0.06, you can use attributes to define your hash as being tied to Tie::Hash::Regex. You’ll need to install the module Attribute::Handlers.

METHODS

    FETCH

Get a value from the hash. If there isn’t an exact match try a regex match.

    EXISTS

See if a key exists in the hash. If there isn’t an exact match try a regex match.

    DELETE

Delete a key from the hash. If there isn’t an exact match try a regex match.

AUTHOR

Dave Cross <dave@mag-sol.com>

Thanks to the Perlmonks <http://www.perlmonks.org> for the original idea and to Jeff japhy Pinyan for some useful code suggestions.

COPYRIGHT

Copyright (C) 2001-8, Magnum Solutions Ltd. All Rights Reserved.

LICENSE

This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

perl(1).

perltie(1).

Tie::RegexpHash(1)

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perl v5.20.3 TIE::HASH::REGEX (3) 2008-06-30

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