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並前往https://docs.racket-lang.org/reference/strings.html

4.4 Strings - Racket Documentation

Two strings are equal? when they have the same length and contain the same sequence of characters. ... (string-normalize-spaces " foo bar baz \r\n\t").

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查詢 「R contains」的人也找了：

  1. R contains
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  2. R contain string
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  3. Vector contains
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  4. Colnames contains r
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  5. %in% in r
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  6. R for (i in range)
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  7. R check if row contains value
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  8. Filter character in r
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