[R] Subset using partial values

[Newbie19_02]

Hi everyone,

I would like to subset a data.frame using partial values.

For example I have the following data.frame:

PROCHI  Main_condition
1234      411
1235     4110
1236     4111
1237     I20
1238    I201
1239    I202

Now let's say that I use the Subset function.  Ordinarily I would use it as
follows  Subset(x, Main_condition=="411"|Main_condition=="4110" etc to get
all the 411s.

Is there a way that you can subset by only using part of the term that you
wish to subset by? 

Thanks,
Natalie
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