convert periodic number to fraction

• Subject: convert periodic number to fraction
• From: Antonio Lapira
• Date: Sat, 24 Nov 2012 13:52:31 +0000 (GMT)

is there a function to convert for example 2,333333333333333333333333333333333333333333333....33333 into 7/3 ?
or 2.51212121212121212..1212121212121 into 2487/990 ?

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