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Current Perl documentation can be found at perldoc.perl.org.
Here is our local, out-dated (pre-5.6) version:
You can do it yourself:
1 while $string =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e;
Or you can just use the Text::Tabs module (part of the standard perl distribution).
use Text::Tabs;
@expanded_lines = expand(@lines_with_tabs);