I did not have time before to give a complete answer to your questions, but if you want upper and lower case letters and ignore case for the sort: 
$ perl -e 'use strict;
> use warnings;
>
> my @a = qw / d1180 a1180 E1180 D250 A1180 E855 E975 A130 A250 B1105 
+b1255 b2480 c1180 c1600  e855 e975 a130 A250 B1105 B1255 B2480/;
>
> print "$_\n"
>         for map "$_->[0]$_->[1]",
>         sort { $a->[1] <=> $b->[1] || uc $a->[0] cmp uc $b->[0]}
>         map { /([a-zA-Z]+)(\d+)/; [$1, $2]} @a;'
A130
a130
A250
A250
D250
E855
e855
E975
e975
B1105
B1105
a1180
A1180
c1180
d1180
E1180
b1255
B1255
c1600
b2480
B2480

[download]
The letter part sort comes before the number part.
Not sure what you mean.

In reply to Re^3: Data with Letter(s) & Number sort query by Laurent_R
in thread Data with Letter(s) & Number sort query by merrymonk

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