On 20 Mar 2021, at 11:30, samar <[email protected]> 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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