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Home/ Questions/Q 7666825
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T14:56:06+00:00 2026-05-31T14:56:06+00:00

How do I remove part of a string? For example in ATGAS_1121 I want

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How do I remove part of a string? For example in ATGAS_1121 I want to remove everything before _.

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  1. Editorial Team
    Editorial Team
    2026-05-31T14:56:07+00:00Added an answer on May 31, 2026 at 2:56 pm

    Use regular expressions. In this case, you can use gsub:

    gsub("^.*?_","_","ATGAS_1121")
    [1] "_1121"
    

    This regular expression matches the beginning of the string (^), any character (.) repeated zero or more times (*), and underscore (_). The ? makes the match “lazy” so that it only matches are far as the first underscore. That match is replaced with just an underscore. See ?regex for more details and references

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