[R] list substring

[calpeda]

thank you,
but I m importing data from a txt file and I have a matrix of n*1
The function str seems to work only from 1*n





Wacek Kusnierczyk wrote:
> 
> calpeda wrote:
>> hi
>> I ve a list of item x = ( "xxxxx1"
>>                                "xxxxx2"
>>                                "yyyyx3")
>>
>> I need to extract a new vector y  = ( "xxxx",
>>                                                    "xxxx",
>>                                                    "yyyy"
>> )
>> I mean, for each item I need to extract the first 4 digit
>> How is that possible?
>>   
> 
>     sub('^(\\d{4}).*', '\\1', x, perl=TRUE)
> 
> vQ
> 
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