[R] StartsWith over vector of Strings?

[Ralf B]

When running the combined code with your suggested line:

content <- data.frame(urls=c(
					"http://www.google.com/search?source=ig&hl=en&rlz=&=&q=stuff&aq=f&aqi=g10&aql=&oq=&gs_rfai=CrrIS3VU8TJqcMJHuzASm9qyBBgAAAKoEBU_QsmVh",
					"http://search.yahoo.com/search;_ylt=Atvki9MVpnxuEcPmXLEWgMqbvZx4?p=stuff&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-701")
)
searchset <- data.frame(signatures=c("http://www.google.com/search"))
content[na.omit(pmatch(searchset, content$urls))]
print(content)

I am getting both URLs as results, but in fact, would expect only the
first URL. Am I overlooking something?


Ralf

On Tue, Jul 13, 2010 at 12:03 PM, Greg Snow <Greg.Snow at imail.org> wrote:
> content[na.omit(pmatch(searchset, content,,TRUE))]
>
> --
> Gregory (Greg) L. Snow Ph.D.
> Statistical Data Center
> Intermountain Healthcare
> greg.snow at imail.org
> 801.408.8111
>
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>> project.org] On Behalf Of Ralf B
>> Sent: Tuesday, July 13, 2010 5:47 AM
>> To: r-help at r-project.org
>> Subject: [R] StartsWith over vector of Strings?
>>
>> Given vectors of strings of arbitrary length
>>
>> content <- c("abc", "def")
>> searchset <- c("a", "abc", "abcdef", "d", "def", "defghi")
>>
>> Is it possible to determine the content String set that matches the
>> searchset in the sense of 'startswith' ? This would be a vector of all
>> strings in content that start with the string of any of the strings in
>> the searchset. In the little example here, this would be:
>>
>> result <- c("abc", "abc", "def", "def")
>>
>> Best,
>> Ralf
>>
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>