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How to extract a substring which is repeated from a long string using regex

I have a string and i want to extract every substring beetwen ", "

How can I write a regex to extract these substrings from the following text?

R1, R1, R3, R1, R1, L2, R5, L2, R5, R1, R4, L2, R3, L3, R4

I have a string and i want to extract every substring beetwen ", "

How can I write a regex to extract these substrings from the following text?

R1, R1, R3, R1, R1, L2, R5, L2, R5, R1, R4, L2, R3, L3, R4

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