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foo this is one example bar
this is a line I don't care about
foo here's another keeper! bar
foo yet another bar
and a line to reject

while ($text =~/foo(*.?)bar/) {
   manipulate ($1)
}

while ($text =~/foo(*.?)bar/g) {
   manipulate ($1)
}

while ($text =~/\Gfoo(*.?)bar/g) {
   manipulate ($1)
}

($text =~/foo(*.?)bar/g)
manipulate ($1);
while ($text =~/\Gfoo(*.?)bar/g) {
   manipulate ($1)
}