I need a regex to put into an array all the text that starts with R1Y2A3N and ends with R1Y2A3N.....

R1Y2A3Ne2p0YWc6cGFyYW0gbmFtZT12ZW5kb3JOYW1lfQ==R1Y2A3N

Example, I have a variable like this:

$variable = 'Hello R1Y2A3Ne2p0YWc6cGFyYW0gbmFtZT12ZW5kb3JOYW1lfQ==R1Y2A3N and you!';

so, R1Y2A3Ne2p0YWc6cGFyYW0gbmFtZT12ZW5kb3JOYW1lfQ==R1Y2A3N  should be put into an array....