I believe this calls for an application of the GRT (untested):
Actually, what you have there is a ST (http://en.wikipedia.org/wiki/Schwartzian_transform). A GRT (http://www.sysarch.com/Perl/sort_paper.html) is characterised by having a simple lexical sort rather than requiring a routine. Like this:
$ perl -le '
> @arr = qw{ TEXT1 TEXT3 TEXT11 TEXT2 TEXT13 };
> print for
> map { substr $_, 9 }
> sort
> map { sprintf q{%09d%s}, ( split m{(?<=[A-Z])(?=\d)} )[ 1 ], $_
+}
> @arr;'
TEXT1
TEXT2
TEXT3
TEXT11
TEXT13
$
I hope this is of interest.
Update: Added references.
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