Seems more likely to be related to changes in the options stringr uses
when it invokes the regex code? See the different response coming from
base R when told to use a different regex engine:
grep( "+proj", "syz+project" )
[1] 1
grep( "+proj", "syz+project", perl=TRUE )
Error in grep("+proj", "syz+project", perl = TRUE) :
invalid regular expression '+proj'
In addition: Warning message:
In grep("+proj", "syz+project", perl = TRUE) :
PCRE pattern compilation error
'nothing to repeat'
at '+proj'
On Thu, 13 Aug 2015, Mauricio Romero wrote:
thanks.... that makes sense... in the previous version of R it worked for
some reason.
On Thu, Aug 13, 2015 at 4:33 PM, Sarah Goslee <sarah.gos...@gmail.com>
wrote:
Hi,
The + is a special character in regular expressions. If you want to
match a literal + you need to escape it:
str_extract("+proj=utm +zone=19 +datum=WGS84 +units=m +no_defs
+ellps=WGS84 +towgs84=0,0,0", "\\+proj=[a-zA-Z0-9]*")
Sarah
On Thu, Aug 13, 2015 at 2:55 PM, 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
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