I am working with a document listing genome location numbers and want to select only those listings that have adjacent (greater or smaller) numerical values.

The dataset is formatted like this:

2L_33
2L_34
3L_45
3L_87
X_202
X_203
X_204

[download]

And I want this as an output (omits values with no numerically adjacent listings):

2L_33
2L_34
X_202
X_203
X_204

[download]

How can I write a script to accomplish this?

In reply to Adjacent numbers by melissa_randel

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