> On 30 Nov 2015, at 14:57, phgrosj...@sciviews.org wrote:
>
>
>> On 30 Nov 2015, at 13:09, Abhinaba Roy <abhinabaro...@gmail.com> wrote:
>>
>> Hey,
>>
>> worked like a charm! :)
>>
>> Could you please explain about
>>
>> sub("^([0-9]*).*$", "\\1", fields)
>>
>
> Yes.
>
> sub() replaces substrings. The first argument captures the interesting part
> of the string:
>
> ^ = start of the string,
>
> ([0-9]*) = capture of the interesting part of the string. [0-9] means any
> figure from 0 to 9. * means 1 or more of these characters, and () is used to
> capture the substring,
>
> .* = all the rest. Dot (.) means any character, and * means again one or more
> of these characters,
>
> $ = the end of the string.
Small correction:
* means zero or more characters
according to ?regex.
Berend
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
