On 16/09/2009, at 9:58 AM, jim holtman wrote:
try:
grep("n.*mytype",mystr)
[1] 1
with the [.] it is a class with a period. '.*' match zero, or
more, characters.
Perhaps the OP wants
grep("n[.].*mytype",mystr)
to insist that ``mystr'' contain the string ``n.'' (literal ``.'')
somewhere before the string ``mytype''.
cheers,
Rolf Turner
On Tue, Sep 15, 2009 at 5:52 PM, Sebastien Bihorel
<sebastien.biho...@cognigencorp.com> wrote:
Dear R-users,
I am trying to use the grep function to test whether a particular
string is
of the form "n.../mydir/myfile.mytype.myext". Anything between n
and mytype
could vary, and anything after mytype could vary. I tried to
proceed by
steps to build my regular expression... but I do not really
understand why
the last call of the following code do not work.
Any help would be greatly appreciated.
mystr <- "n.../mydir/myfile.mytype.myext"
grep("mytype",mystr)
# returns 1
grep("[.]*mytype",mystr)
# returns 1
grep("n[.]*mytype",mystr)
# returns integer(0)
Sebastien
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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