[R] Placeholders for String Operations

[Simon Pickert]

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