Hello, The function you are looking for is grepl. Something like this perhaps:
> words <- c("WORD ( 123 )","WORD(1)", "WORD\t ( 21\t) ", "WORD\t ( 21\t) " )
> grepl( "[[:space:]]*[(][[:space:]]*[0-9]+[[:space:]]*[)]", words ) [1] TRUE TRUE TRUE TRUE [[:space:]]* : any number of spaces or tabs (including 0 times) [(] : a ( [0-9]+ : any number of digits, but at least one [)] : a ) Romain On 11/13/2009 03:12 PM, 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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