[R] How do I subset a dataframe

[eric]

I have a dataframe zeespan. One of the columns has the name "customer". The
data in the customer column is text. I would like to return a subset of the
dataframe with all rows that DON'T begin with either "ibm" or "exxon", or
"sears" in the customer column.

I tried ....  subset(zeespan, customer != c("ibm" | "exxon" | "sears") )

That didn't work and even if it did, the text would have to be an exact
match where what I really want is "begins with".

Suggestions on how to do this would be appreciated

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