Parser for strange floating point arrays embedded in XML

I have something which stores numeric data in XML in the form

[r1.24, r0.56, r0.0]

Is there anything standard which parses such a numeric array syntax, or do I have to write a small parser?

What sort of numbers are that? Why do they begin with r?

Someone implemented them that way around 2001. I have to read them.

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Disregard; coded parser. Thanks.

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