Thank you! This is helpful, and the result better than mine was.
However, when I run the text filter, not all occurrences of the first
element get replaced when necessary:
[image: tab3.png]
Here a tab should also replace A1 in line 5, A2 in line 12, and A3 in line
18.
Thanks
samar
On Saturday, March 20, 2021 at 4:41:36 PM UTC+1 John R M. Delacour wrote:
>
> On 20 Mar 2021, at 11:30, samar <arne...@bluewin.ch> wrote:
>
> I'm looking for something which I assume is pretty easy to accomplish with
> GREP but I fail to see how.
>
> I have a large text file with entries sorted in this way:
>
> ...That is, the first element is replaced by a tab character *if* the
> first element is a repetition of the first element of the previous line(s).
> The sort order remains unchanged.
>
>
> Create a text filter "~/Library/Application Support/BBEdit/Text
> Filters/SAMAR.pl" and run it from the Text Filters palette (opened from
> Window menu). The script will affect the whole file, or just the selection
> if one is made:
>
>
> #! /usr/bin/perl
> my $a;
> while (<>) {
> my ($col1, $col2) = split "\t", $_;
> if ($col1 eq $a) {
> print "\t$col2"
> } else {
> print "$col1\t$col2";
> $a = $col1;
> }
> }
>
>
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