[R] Help with complicated regular expression

[Gabor Grothendieck]

\w+ will match one or more word characters and \s* will match 0 or
more spacing characters so if this must the described text must be the
complete expression then:

grepl("^\\w+\\s*\\(\\s*\\w+\\s*\\)$", x)

or if its ok for other text to appear before and after as long as the
indicated text is among it then remove the ^ and $.  The above gives a
logical vector as a result or if we use grep rather than grepl we can
get a vector of indexes.

On Fri, Nov 13, 2009 at 9:12 AM, Dennis Fisher <fisher at plessthan.com> 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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