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regex - R: How to replace . in a string?

I have a string say "a.b" and I want to replace "." with "_".

gsub(".","_","a.b")

doesn't work as . matches all characters.

gsub(".","_","a.b")

Just gives me an error.

Reading the documentation on ?gsub is not that helpful!

So how to do this straight-forward thing?

See Question&Answers more detail:os

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. matches any character. Escape . using to match . literally.

itself is also should be escaped:

> gsub("\.", "_", "a.b")
[1] "a_b"

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