sub(",$","",gsub("^,*|,*$|(,)*", "\\1",
",,,apple,,orange,,,,,lemon,strawberry,,,,"))
It may not be the best solution, but it was my first thought
Tom
----- Original Message -----
From: "Daren Tan" <darenta...@gmail.com>
To: <r-help@r-project.org>
Sent: Saturday, March 14, 2009 6:42 PM
Subject: [R] gsub and regex to tidy comma-limited values
I am cleaning up comma-limited values, so that only one comma
separates each value. Using the example below, as much as I try with
regex, I can't remove the last comma. I hope to have a one-liner
solution, if possible.
gsub("^,*|,*$|(,)*", "\\1", ",,,apple,,orange,,,,,lemon,strawberry,,,,")
[1] "apple,orange,lemon,strawberry,"
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
