[R] Placeholders for String Operations

[arun]

Hi,
 gsub("#%", "[percentagevalue]", text1) 
#[1] "this is a number 23%"


 gsub("\\d+%$", "[percentagevalue]", text1) 
#[1] "this is a number [percentagevalue]"


 gsub("bla", "23", text2) 
#[1] "this is not a number 23%"
A.K.



----- Original Message -----
From: Simon Pickert <simon.pickert at t-online.de>
To: r-help at r-project.org
Cc: 
Sent: Wednesday, September 4, 2013 11:17 AM
Subject: [R] Placeholders for String Operations

Hi all,

what are the placeholders for string operations/modifications? Is there a placeholder for numbers, which would allow me to easily replace all numbers in a string? Something like

text1 <- c("this is a number 23%")
text2 <- c("this is not a number bla%")

newtext1 <- gsub(#%, [percentagevalue], text) 
newtext2 <- gsub(#%, [percentagevalue], text) 


newtext1  should be "this is a number [percentagevalue]"
newtext2  should be "this is not a number 23%"


I figured there is * ? . but I can't find a source that explains their use and lists other placeholders..


Appreciate your help!
Thanks
Simon
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