Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

If you felt brave enough you could combine the above with tie and then make all the tests transparent to your program.

A try (untested)

package Tie::Match; use strict; sub TIESCALAR { my ($class, $regex) = @_; return bless [undef, $regex], $class; } sub STORE { my ($self, $new) = @_; $self->[0] = $new =~ $self->[1] ? $new : undef; } sub FETCH { my ($self) = @_; return $_->[0]; } sub UNTIE { } sub DESTROY { } __END__ =head1 NAME Tie::Match - Tie a scalar that is undef when not matching a regex =head1 SYNOPSIS tie my $scalar, 'Tie::Match', qr/^[1-5]+$/; while ($scalar = <>) { if (defined $scalar) { print "Match: $scalar\n"; } else { print "No match.\n"; } } =head1 DESCRIPTION Ties a scalar. The scalar can be set, but will be undef if the new value does not match the given regex. =head1 URL =cut


In reply to Re: Re: Detect presence of numbers 1-9 by Juerd
in thread Detect presence of numbers 1-9 by kiat

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (8)
As of 2021-06-21 16:20 GMT
Find Nodes?
    Voting Booth?
    What does the "s" stand for in "perls"? (Whence perls)

    Results (99 votes). Check out past polls.