R help - Oct 2010 - Find index of a string inside a string?

Hi, 
I am searching for the equivalent of the function Index from SAS. 

In SAS: index("abcd", "bcd") will return 2 because bcd is
located in the 2nd cell of the abcd string.
The equivalent in R should do this:
> myIndex <- foo("abcd", "bcd") #return 2. 
What is the function that I am looking for?

I want to use the return value in substr, like I do in SAS.

thanks, y. baranan.
 		 	   		  
	[[alternative HTML version deleted]]

For simple searches, use grep with fixed=TRUE.
Check ?grep.


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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of yoav baranan
Sent: maandag 25 oktober 2010 13:27
To: r-help at r-project.org
Subject: [R] Find index of a string inside a string?


Hi, 
I am searching for the equivalent of the function Index from SAS. 

In SAS: index("abcd", "bcd") will return 2 because bcd is
located in the 2nd
cell of the abcd string. 
The equivalent in R should do this:
> myIndex <- foo("abcd", "bcd") #return 2. 
What is the function that I am looking for?

I want to use the return value in substr, like I do in SAS.

thanks, y. baranan.
 		 	   		  
	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

I think what you want is 'regexpr':
> regexpr("bcd", "aabcd")
[1] 3
attr(,"match.length")
[1] 3
>

On Mon, Oct 25, 2010 at 7:27 AM, yoav baranan <ybaranan at hotmail.com>
wrote:
>
> Hi,
> I am searching for the equivalent of the function Index from SAS.
>
> In SAS: index("abcd", "bcd") will return 2 because bcd
is located in the 2nd cell of the abcd string.
> The equivalent in R should do this:
>> myIndex <- foo("abcd", "bcd") #return 2.
> What is the function that I am looking for?
>
> I want to use the return value in substr, like I do in SAS.
>
> thanks, y. baranan.
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


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Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?