I have a file where each line contains a keyword (HELLO) and one or more numerical fields designated A1, A2, etc. The value in the numerical field is enclosed in brackets after the field name and is optional; if not present, it defaults to 0. Each field can contain multiple numbers separated by :; I only care about the first. I need to replace the keyword (HELLO) with `A1[X-Y+1]. Here is a quick example:case1: my test is (HELLO) with some numbers (A1, A2, A3, A4)case2: my test is (HELLO) with some numbers (A1[X:Y], A2, A3, A4)case3: replaceit(something(HELLO)) sometext (single_bit_here, somedatahere[4], something, something,something,something) ;In the first one, the field A1 isn't given a value, so 0 is assumed. 0+1=1, so the output is 1.In the second case, A1 has a range X:Y, so the result is X-Y+1. Let's have X=10 and Y=3. Then HELLO will become 10-3+1=8.Output:case1: my test is (1) with some numbers (A1, A2, A3, A4)case2: my test is (X-Y+1) with some numbers (A1[X:Y], A2, A3, A4)case3: replaceit(something(1)) sometext (single_bit_here, somedatahere[4], something, something,something,something) ;The code was modified a bit and it worked for all situations.  awk 'BEGIN {FS=[[\\]]}{nFields=split($2,a,:)if(nFields ==2) n=1+a[1]-a[2]else n=1gsub(data_width, n) } 1' <datain.txtthe following on question: I need to do the same inline replacement for all files in the same dir so I don't need to save back files.  I'd like to use the perl script suggested below.
replace a pattern found with a number plus 1 on the same line
text processing;awk;perl
The test data:$ cat datacase1: my test is (HELLO) with some numbers (A1, A2, A3, A4)case2: my test is (HELLO) with some numbers (A1[10:3], A2, A3, A4)case3: replaceit(something(HELLO)) sometext (single_bit_here, somedatahere[4], something, something,something,something) ;The Perl script:#!/usr/bin/perluse strict;use warnings;while (<>) {    my $n = 1;    $n = 1 + $1 - $2 if (/\([^\,)]*\[(\d+)(?::(\d+))?[^\)]*\)[^\)]*$/);    s/HELLO/$n/;    print;}The output:$ ./the-script.pl < datacase1: my test is (1) with some numbers (A1, A2, A3, A4)case2: my test is (8) with some numbers (A1[10:3], A2, A3, A4)case3: replaceit(something(1)) sometext (single_bit_here, somedatahere[4], something, something,something,something) ;