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Anyone please help... USN= 1DS19CS010 What will be it's regex in java

with following constraints?
.Each USN must be length of 10 characters
. 1st character must be digit and have either 1 or 2
. 2nd and 3rd characters must be upper case letters
. 4th and 5th characters must be digits and can have values between 0-9
. 6th and 7th characters must be upper case letters and can have combination any of the following: CS, IS, EC and ME
. 8th, 9th and 10th characters must be digits and can have values between 0-9

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google has ans

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