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What is the extended regular expression for following question. E.g. Social security number in the format of 999-99-9999. Answer: [0-9]{3}-[0-9]{2}-[0-9]{4} Non-negative integers. (e.g. 0, +1,

What is the extended regular expression for following question.

E.g. Social security number in the format of 999-99-9999.

Answer: [0-9]{3}-[0-9]{2}-[0-9]{4}

Non-negative integers. (e.g. 0, +1, 3320)

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