One of these should be a start. If there can be no extra text at the beginning or end, start with
"^" and end with "$".
x <- c("WORD ( 123 )", "WORD(1 )", "WORD\t ( 21\t)", "WORD \t ( 1 \t )",
"decoy((2))", "more words in front(2)")
grep("[[:alpha:]]+[ \t]*\\([ \t]*[0-9]+[ \t]*\\)", x)
[1] 1 2 3 4 6
grep("^[[:alpha:]]+[ \t]*\\([ \t]*[0-9]+[ \t]*\\)", x)
[1] 1 2 3 4
-- Tony Plate
Dennis Fisher wrote:
Colleagues,
I am using R (2.9.2, all platforms) to search for a complicated text
string using regular expressions. I would appreciate any help you can
provide.
The string consists of the following elements:
SOMEWORDWITHNOSPACES
any number of spaces and/or tabs
(
any number of spaces and/or tabs
integer
any number of spaces and/or tabs
)
Examples include:
WORD ( 123 )
WORD(1 )
WORD\t ( 21\t)
WORD \t ( 1 \t )
etc.
I don't need to substitute anything, only to identify if such a string
exists.
Any help with regular expressions would be appreciated.
Thanks.
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
