[R] regular expression question

[MacQueen, Don]

I know you already have a couple of solutions, but I would like to mention
that it can be done in two steps with very simple regular expressions. I
would have done:

s <- c("lngimbintrhofixed","lngimbnointnorhofixed","test",
       'rhofixedtest','norhofixedtest')
res <- gsub('norhofixed$', '',s)
res <- gsub('rhofixed$', '',res)
res
[1] "lngimbint"      "lngimbnoint"    "test"
    "rhofixedtest"   "norhofixedtest"


(this is for those of us who don't understand regular expressions very
well!) 

-Don

-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 1/12/15, 11:37 AM, "Mark Leeds" <markleeds2 at gmail.com> wrote:

>Hi All: I have a regular expression problem. If a character string ends
>with "rhofixed" or "norhofixed", I want that part of the string to be
>removed. If it doesn't end with either of those two endings, then the
>result should be the same as the original. Below doesn't work for the
>second case. I know why but not how to fix it. I lookrd st friedl's book
>and I bet it's in there somewhere but I can't find it. Thanks.
>
>s <- c("lngimbintrhofixed","lngimbnointnorhofixed","test")
>
>result <- sub("^(.*)([n.*|r.*].*)$","\\1",s)
>
> print(result)
>[1] "lngimbint"     "lngimbnointno" "test"
>
>	[[alternative HTML version deleted]]
>
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