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Home/ Questions/Q 6253353
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T13:58:39+00:00 2026-05-24T13:58:39+00:00

In Ruby, how can I check if some file contains some word? I’ve tried

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In Ruby, how can I check if some file contains some word? I’ve tried this:

foo = File.open('some-file', 'r').read
foo.index(/^word$/)

But this won’t work.

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  1. Editorial Team
    Editorial Team
    2026-05-24T13:58:39+00:00Added an answer on May 24, 2026 at 1:58 pm
    File.readlines('some-file').grep(/word/)
    

    Remeber that ^ matches against the beginning of a line, and $ matches against the end of a line. So if you search for ^xyz$ you are really searching for either xyz\n (beginning of file) or \nxyz\n (somewhere in the middle of the file). No other strings will match.

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