[R] Using grep() to subset lines of text

From: ppaarrkk <simon_ecc_at_yahoo.co.uk>
Date: Sat, 29 Nov 2008 04:00:43 -0800 (PST)

I have two vectors, a and b. b is a text file. I want to find in b those elements of a which occur at the beginning of the line in b. I have the following code, but it only returns a value for the first value in a, but I want both. Any ideas please.

a = c(2,3)

b = NULL

b[1] = "aaa 2 aaa"
b[2] = "2 aaa"
b[3] = "3 aaa"
b[4] = "aaa 3 aaa"

grep(paste("^",a, sep=""), b )

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