1BEGIN { 2 str = "abc"; print gsub("b+", "FOO", str), str 3 str = "abc"; print gsub("x*", "X", str), str 4 str = "abc"; print gsub("b*", "X", str), str 5 str = "abc"; print gsub("c", "X", str), str 6 str = "abc"; print gsub("c+", "X", str), str 7 str = "abc"; print gsub("x*$", "X", str), str 8 str = "abc"; print gsub("b|$", "X", str), str 9} 10