I have a string of DNA bases and I need to count the number of times I have two identical bases at a certain distance from each other.

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Nitzan Kahn on 18 Jun 2018

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Commented: Nitzan Kahn on 18 Jun 2018

Accepted Answer: Guillaume

I have a string of DNA bases and I need to count the number of times I have two identical bases at a certain distance from each other. For example- number of times for 'AA', 'AXA', 'AXXA' and so on.. Would love some help with finding the right function.

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Guillaume on 18 Jun 2018

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sum(regexp(yourchararray, 'A[^A]{0,2}A'))

2 being the maximum distance between two A (and 0 the minimum). The regexp says match A followed by 0 to 2 not A, followed by a A.

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Nitzan Kahn on 18 Jun 2018

It works, thank you!

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