[R] Extract elements that starts with...

[Joel]

Hi 

I got an table that contains this colum and i wonder if there is any nice
way to extract all rows that contains all dose that start with A02, so all
the rows that have A020 and A021 etc etc...

| A010 |
| A010 |
| A010 |
| A020 |
| A020 |
| A020 |
| A020 |
| A020 |
| A021 |
| A021 |


Thx for your help
//Joel
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