Wolfram Fischer wrote:
> What's really the problem with:
>
>> regexpr( '\.odt$', "xxxxYodt", perl=TRUE )
> Warning: '\.' is an unrecognized escape in a character string
> Warning: unrecognized escape removed from "\.odt$"
> [1] 5
> attr(,"match.length")
> [1] 4
>
> I know that I could use:
>> regexpr( '[.]odt$', "xxxxYodt", perl=TRUE )
>
> But it seems to me that the first expression is also
> an accepted regular expression in accordance with perl.
In R you have to escape the "\".
From the help page of regexpr:
## Double all 'a' or 'b's; "\" must be escaped, i.e., 'doubled'
gsub("([ab])", "\\1_\\1_", "abc and ABC")
HTH,
Tobias
--
Tobias Verbeke - Consultant
Business & Decision Benelux
Rue de la révolution 8
1000 Brussels - BELGIUM
+32 499 36 33 15
[EMAIL PROTECTED]
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
