Is a region filter already available for TT?

What I mean by region filter is something that takes a series of input lines but only returns those within a certain region.

If no such filter is written, I propose one with the following API:

region($a, $b) where $a and $b specify the start and end of the lines to return

• if $a is a number, it specifies the first line to return
• if $a is a regexp lines will begin to be returned once that line is reached
• if $b is a number it is the last line to return
• if $b is a regexp, lines will be returned until and including the match of this regexp
• if $b is not specifed then all lines starting with $a to end of text will be returned.

It looks like TT filters can only accept numbers and strings, so a string argument would be turned into a regexp.

example: Include a .pm file, but ignore the trailing pod:

[% INCLUDE source_code.pm | region('^package', '^1;') | indent %]
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