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Asked: 2026-05-25T17:19:58+00:00

Given this string: DNS000001320_309.0/121.0_t0 How would I return everything before the second occurrence of

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Given this string:

DNS000001320_309.0/121.0_t0

How would I return everything before the second occurrence of “_”?

DNS000001320_309.0/121.0

I am using R.

Thanks.

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1 Answer

  1. Editorial Team

    I think this might do the task (regex to match everything befor the last occurence of _):

    _([^_]*)$

    E.g.:

    > sub('_([^_]*)$', '', "DNS000001320_309.0/121.0_t0")
[1] "DNS000001320_309.0/121.0"
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