Dear Monks,

I am a looking for strings which are similar.
The differences between these strings concern only the last character or the last number.

Furthermore, the differences are + 1 / - 1 for the number

And the differences are + 1 / -1 for the place of the letters in the alphabet
What are the tools to use ?
For example, here is my start file 
AAA30
BBC5
SHT12H
DAL33B
BBC49
AAA31
DAL33A
BBC6
SHT12G
BBC50

[download]

Here is the output file I would like : 
AAA30;AAA31     
BBC5;BBC6
SHT12H;SHT12G
DAL33B;DAL33A
BBC49;BBC50
AAA31;AAA30
DAL33A;DAL33B
BBC6;BBC5
SHT12G;SHT12H
BBC50;BBC49

[download]

Update :

1) Thanks a lot for your answers, that's very nice of you

2) for the names whose last characters are numbers, for example, AAA30, I would like to look for the AAA29 and the AAA31, and for the NB6, I would like to search for NB5 and NB7.
There are only at maximum two numbers that may change

3)for the names whose last characters are letters, they end with one or two letters

4)if there is only one letter at the end, then I look for the letters next to the one in the order of alphabet for example, if it is AU33H, I would like to look for AU33G and AU33I

5)if there are two letters at the end, then it is only the first one that will change and it is also a letter that will be very close in the order of alphabet for ex : DLH4KF : I would like to look for DLH4JF and DLH4LF

6)there are no negative numbers

7)when a string ends by Z or 99, there is no need to look AA, or 100, ...

8)the length of the string of the couple looked for must be the same (it excludes cases such as the couple ABF99 / ABF100)

In reply to searching for strings by steph_bow

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