[R] help with gsub and grep functions

[Simon Fear]

Well, this works for the first one:

> sub(" \\([A-Za-z0-9_ ]*\\)", "", Names)

and from there the second one is fairly obvious I hope.

QUESTION: having recently been using Source Edit I wanted
to write [\\w]* instead of [A-Za-z0-9_ ]* but that doesn't
seem to work in R. ?grep points to
ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/
but I can't access that (server/gateway restriction). So,
could anyone tell me exactly what is allowed in R regular
expressions? A URL to the POSIX standards would be useful
too.

In fact it would be even more useful if R's particular choice
of RE syntax, together with R's multiple backslashes, was given 
somewhere in the R help itself ... yes I will write it if someone 
gives me the info or points me in the right direction ...


> -----Original Message-----
> From: Martin Olivier [mailto:martinol at ensam.inra.fr]
> Sent: 13 October 2003 15:31
> To: r-help
> Subject: [R] help with gsub and grep functions
> 
> 
> Security Warning:
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> ________________________________________________________________
> 
> Hi all,
> 
> Let Names a vector of chatacters. For example,
> 
>  > Names
> [1] "g 604 be-0 -p1 (602 matches)" "g 606 Phli-0 -p2 (517 matches)"
> [3] "g 608 alu-0  (659 matches)"
> 
> I try to use gsub or grep functions for two problems :
> 
> 1. First, I would like to delete all the characters between 
> parentheses.
> [1] "g 604 be-0 -p1" "g 606 be-0 -p2"
> [3] "g 608 be-0 -p3"
> 
> 2. And, I would like to extract the characters between parentheses
> [1] "602 matches" "517 matches"
> [3] "659 matches"
> 
> 
> 
> Any idea?
> 
> Best regards,
> Olivier
> 
> -- 
> 
> -------------------------------------------------------------
> Martin Olivier
> INRA - Unité protéomique           LIRMM - IFA/MAB
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> Tel : 04 99 61 27 01               Tel : O4 67 41 86 71
> martinol at ensam.inra.fr             martin at lirmm.fr
> 
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>
 

Simon Fear
Senior Statistician
Syne qua non Ltd
Tel: +44 (0) 1379 644449
Fax: +44 (0) 1379 644445
email: Simon.Fear at synequanon.com
web: http://www.synequanon.com
 
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