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What R function should I use to check if a substring or a character is present in a string?

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The grepl() function can be used to check if a character or a substring is present in a string.

Here is an example:

> a="Hello world!!"
> grepl('Hello', a)
[1] TRUE
> grepl('Hello1', a)
> grepl('H', a)
[1] TRUE
> grepl('h', a)