R help - Jul 2018 - help with merging two dataframes function of "egrep"-like formulas

Dear all,

please may I ask for a piece of advise regarding merging two dataframes :

A <- data.frame(z=c("a*b", "c*d", "d*e",
"e*f"), t =c(1, 2, 3, 4))

B <- data.frame(z=c("a*b::x*y", "c", "",
"g*h"), t =c(1, 2, 3, 4))

function of the criteria :

if "the elements in the 1st column of A could be found among the elements
of the 1st column of B" i.e.

for the example above, we shall combine in the results only the row with
"a*b" of A with the row with "a*b::x*y" of B.

thank you,

bogdan

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