Hi, I am still learning Perl. I am trying to do the following search an replace for a txt file. But have no clue how to do this. Any help and code example is appreciated. Thanks. Sample Data: 
 
57KXNWLRZWJ3
057E8bf0D030
057E8bf0D032
58KXNWLRZWKB
058E8bf0D02A
058E8bf0D02C

[download]
Problem: 1. Generate a 2 digit random number. Replace the first two digits in row 1 (e.g 57) with the new number. Use the same generated number for next two rows. Repeat the process for next 3 rows and so on, till EOF. 2. generate random number to replace the last two digits in row 2 & 3 then repeat the process for 5 & 6 and so on, till EOF. The result file will look like this. Let's say we generated a random number 12 and then next random number is 22. Also last two digits were replaced with the randomly generated numbers. 
 
12KXNWLRZWJ3
012E8bf0D011
012E8bf0D067
22KXNWLRZWKB
022E8bf0D020
022E8bf0D023

[download]

In reply to Search and replace text by nsyed

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