"+" is a special character in regular expressions that requires a preceding
pattern to apply to. See ?base::regex.
You need to escape the special with a backslash to remove the special behavior,
and escape the backslash so the R parser will be happy.
str_extract("+proj=utm +zone=19 +datum=WGS84 +units=m +no_defs +ellps=WGS84
+towgs84=0,0,0", "\\+proj=[a-zA-Z0-9]*")
Please read and follow the Posting Guide, including sending your emails using
plain text instead of HTML.
---------------------------------------------------------------------------
Jeff Newmiller The ..... ..... Go Live...
DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go...
Live: OO#.. Dead: OO#.. Playing
Research Engineer (Solar/Batteries O.O#. #.O#. with
/Software/Embedded Controllers) .OO#. .OO#. rocks...1k
---------------------------------------------------------------------------
Sent from my phone. Please excuse my brevity.
On August 13, 2015 11:55:36 AM PDT, Mauricio Romero
<mauricioromerolond...@gmail.com> wrote:
>Hi,
>
>I'm running R 3.2.1 and im having an unexpected problem... when I run
>the
>follwing code it returns an error
>
>library(stringr)
>str_extract("+proj=utm +zone=19 +datum=WGS84 +units=m +no_defs
>+ellps=WGS84
>+towgs84=0,0,0", "+proj=[a-zA-Z0-9]*")
>
>But I can't find whats wrong with my code.
>
>Thanks
>
>Mauricio
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>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.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
