Template::Plugin::Subst - s/// functionality for Template Toolkit templates
[% USE Subst %] [% str = 'foobar' %] [% str.subst('(foo)(bar)', '$2$1', 1) %]
[% USE filt = Subst pattern = '(foo)(bar)' replacement = '$2$1' global = 1 %]
[% text | $filt %]
[% FILTER $filt %] foobar [% END %]
Template::Plugin::Subst acts as a filter and a virtual method to carry out regular expression substitutions with back references on text and variables in the Template Toolkit.
That's the advantage of this approach over the built-in
replace doesn't deal with backrefs, so code like this:
[% str = 'foobar' %] [% str.replace('(foo)(bar)', '$2$1') %]
inserts a literal
$2$1 in to your document.
But with Template::Plugin::Subst;
[% USE Subst %] [% str = 'foobar' %] [% str.subst('(foo)(bar)', '$2$1') %]
you get the expected
It can also be used as a filter, in which case it's very useful for finding information in text and augmenting it in a useful fashion.
For example, suppose you want all strings of the form
rt#\d+, which reference RT ticket numbers, to be converted to links to your local RT installation.
First, instatiate the filter:
[% USE rt = Subst pattern = 'rt#(\d+)' replacement = '<a href="/rt.cgi?t=$1">rt#$1</a>' %]
and then use it to filter arbitrary text:
[% text_variable | $rt %]
.subst($pattern, $replacement[, $global])
As a vmethod the first two arguments are the pattern to search for and the string to replace it with. These arguments are mandatory.
The third argument is a boolean that specifies whether or the search/replace should be global, and behaves in the same way as the
g modifier on a
s/// operation. The default value is '1'. Note that this differs from the default setting on the
[% USE filt = Subst pattern = '...' replacement = '...' global = 1 %]
These three named arguments have the same semantics as the arguments to the vmethod.
global is optional, and defaults to 1.
Please report any bugs or feature requests to
email@example.com, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Template-Plugin-Subst. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
Copyright (c) 2005 Nik Clayton All rights reserved.
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