Remove part of string after

Question

I am working with NCBI Reference Sequence accession numbers like variable a   a  lt - c  NM 020506 1   NM 020519 1   NM 001030297 2   NM 010281 2   NM 011419 3    NM 053155 2       To get information from the biomart package I need to remove the  1   2 etc  after the accession numbers  I normally do this with this code   b  lt - sub            a      1                      But as you can see  this isn t the correct way for this variable  Can anyone help me with this

User · Answer

If the string should be of fixed length  then substr from base R can be used   But  we can get the position of the   with regexpr and use that in substr  substr a  1  regexpr        a -1    1   NM 020506      NM 020519      NM 001030297   NM 010281      NM 011419      NM 053155

User · Answer

You just need to escape the period   a  lt - c  NM 020506 1   NM 020519 1   NM 001030297 2   NM 010281 2   NM 011419 3    NM 053155 2    gsub            a   1   NM 020506      NM 020519      NM 001030297   NM 010281      NM 011419      NM 053155

User · Answer

You could do   sub       0-9        a    or  library stringr  str sub a  start 1  end -3

User · Answer

We can pretend they are filenames and remove extensions   tools  file path sans ext a     1   NM 020506      NM 020519      NM 001030297   NM 010281      NM 011419      NM 053155

[r] Remove part of string after "."

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