library(stringr)
my_text <- "The World Cup 2022 winners, Argentina, have failed to dislodge Brazil from the top of the Fifa men’s world rankings as England remain fifth in the post-Qatar standings.
Had Argentina won the final within 90 minutes, they would have taken the top spot from Brazil. In the last eight tournaments going back to USA 94, no team leading the rankings at kick-off has won the tournament, with only Brazil, the 1998 finalists, getting beyond the quarter-finals."
my_teams <- tolower(c("Brazil", "Argentina"))
pattern <- paste0("(?i)\\b(?:", paste(my_teams, collapse = "|"), ")\\s+(\\S+(?:\\s+\\S+){4})")
res <- lapply(str_match_all(my_text, pattern), function (m) m[,2])
v <- unlist(res)
paste(v, collapse=' ')

bGlicmFyeShzdHJpbmdyKQpteV90ZXh0IDwtICJUaGUgV29ybGQgQ3VwIDIwMjIgd2lubmVycywgQXJnZW50aW5hLCBoYXZlIGZhaWxlZCB0byBkaXNsb2RnZSBCcmF6aWwgZnJvbSB0aGUgdG9wIG9mIHRoZSBGaWZhIG1lbuKAmXMgd29ybGQgcmFua2luZ3MgYXMgRW5nbGFuZCByZW1haW4gZmlmdGggaW4gdGhlIHBvc3QtUWF0YXIgc3RhbmRpbmdzLgpIYWQgQXJnZW50aW5hIHdvbiB0aGUgZmluYWwgd2l0aGluIDkwIG1pbnV0ZXMsIHRoZXkgd291bGQgaGF2ZSB0YWtlbiB0aGUgdG9wIHNwb3QgZnJvbSBCcmF6aWwuIEluIHRoZSBsYXN0IGVpZ2h0IHRvdXJuYW1lbnRzIGdvaW5nIGJhY2sgdG8gVVNBIDk0LCBubyB0ZWFtIGxlYWRpbmcgdGhlIHJhbmtpbmdzIGF0IGtpY2stb2ZmIGhhcyB3b24gdGhlIHRvdXJuYW1lbnQsIHdpdGggb25seSBCcmF6aWwsIHRoZSAxOTk4IGZpbmFsaXN0cywgZ2V0dGluZyBiZXlvbmQgdGhlIHF1YXJ0ZXItZmluYWxzLiIKbXlfdGVhbXMgPC0gdG9sb3dlcihjKCJCcmF6aWwiLCAiQXJnZW50aW5hIikpCnBhdHRlcm4gPC0gcGFzdGUwKCIoP2kpXFxiKD86IiwgcGFzdGUobXlfdGVhbXMsIGNvbGxhcHNlID0gInwiKSwgIilcXHMrKFxcUysoPzpcXHMrXFxTKyl7NH0pIikKcmVzIDwtIGxhcHBseShzdHJfbWF0Y2hfYWxsKG15X3RleHQsIHBhdHRlcm4pLCBmdW5jdGlvbiAobSkgbVssMl0pCnYgPC0gdW5saXN0KHJlcykKcGFzdGUodiwgY29sbGFwc2U9JyAnKQ==