[R] Regexpr with "."
B.Rowlingson at lancaster.ac.uk
Wed Aug 13 16:54:49 CEST 2003
Thompson, Trevor wrote:
> It looks like R is treating every character in the string as if it were
> decimal. I didn't see anything in the help file about "." being some kind
> of special character. Any idea why R is treating a decimal this way in
> these functions? Any suggestions how to get around this?
'.' is the regexpr character for matching any single character!
> regexpr("a.e", "Female.Alabama")
To actually search for a dot, you need to 'escape' it with a
backslash, but of course the backslash needs escaping itself, with
another backslash. Luckily that backslash doesn't need escaping,
otherwise we would quickly run out of patience.
> regexpr("\\.", "Female.Alabama")
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