Hi: Gabor's solution does do it in a single line. he just used paste to
make the line. see below. John's is sort of a single line also but he
called sub twice.
I doubt that it's possible to make it shorter than those solutions.
# Gabor's solution spelled out.
patReg1 <- "(^[ <*]+)"
patReg2 <- "([ > ]+$)"
temp <- paste(patReg1, patReg2, sep = "|")
print(temp)
gsub(temp, "", varReg)
On Tue, Nov 4, 2008 at 12:10 AM, Ferry wrote:
Dear John, Gabor ...
Thank you for your fast responses.
In term of efficiency, does my code efficient? I mean, I thought there
is a way to combine both patterns into a single line.
Also, I tried to substitute the pattern ([ <*]+) with ([[:punct:]]),
as in R regex docs:
patReg1 <- "(^[[:punct:]]+)"
but it doesn't work.
or, possibly it just my stupidity ?
On Mon, Nov 3, 2008 at 5:59 PM, John Fox <[EMAIL PROTECTED]> wrote:
Dear Ferry,
You're almost all the way there. Just apply each substitution in
turn:
varReg <- "* < <* this is my text > > "
left <- "(^[ <*]+)"
right <- "([ > ]+$)"
sub(right, "", sub(left, "", varReg))
[1] "this is my text"
I hope this helps,
John
------------------------------
John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On
Behalf Of Ferry
Sent: November-03-08 8:38 PM
To: r-help@r-project.org
Subject: [R] regex question
hello,
i am trying to extract text using regex as follows:
"* < <* this is my text > > "
into:
"this is my text"
below what I did:
varReg <- "* < <* this is my text > > "
## either this pattern
patReg <- "(^[ <*]+)"
## or below patten
patReg <- "([ > ]+$)"
sub(patReg, '', varReg)
depending of which patten I use, I could only extra the first
portion
or the last portion of the unwanted characters. how to extract both
ends and keep my text "this is my text" ?
I have tried with gsub, as below:
patReg <- "([ >* ]+)"
gsub(patReg, '', varReg)
but it returned "thisismytext"
any idea is appreciated.
thanks,
ferry
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and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
