[R] how to use AND in grepl

[Tom Wright]

subset(df,grepl("t2|pd",x$Command))


On Sat, Apr 30, 2016 at 2:38 PM, ch.elahe via R-help <r-help at r-project.org>
wrote:

> Hi all,
>
> I have one factor variable in my df and I want to extract the names from
> it which contain both "t2" and "pd":
>
>   'data.frame': 36919 obs. of 162 variables
>    $TE                :int 38,41,11,52,48,75,.....
>    $TR                :int 100,210,548,546,.....
>    $Command          :factor W/2229 levels
> "_localize_PD","_localize_tre_t2","_abdomen_t1_seq","knee_pd_t1_localize","pd_local_abdomen_t2"...
>
> I have tried this but I did not get result:
>
>   t2pd=subset(df,grepl("t2",Command) & grepl("pd",Command))
>
>
> does anyone know how to apply AND in grepl?
>
> Thanks
> Elahe
>
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