[R] grepl

[Duncan Murdoch]

On 13-05-13 4:19 AM, Francesco Isotta wrote:
> Hello,
> it is not clear to me, how to search if in a string there is a "." (full
> stop).
> Using:
>
> grepl(".",string)
>
> doesn't work because the full stop it is a metacharacter (it gives "TRUE"
> also if no full stop is in the character).

Use grepl(".", string, fixed=TRUE).


I tried also to insert \. but it
> does not work.

You did not insert \., because you'd need to escape the backslash to do 
that.  grepl("\\.", string) would work.

Duncan Murdoch

>
>> grepl("\.",string)
> Error: '\.' is an unrecognized escape in character string starting "\."
>
> Thank you very much for your help
>
> Francesco
>
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