Question: Write the extended regular expression for: Phone number in any of the following format: 999-(999)9999, 999999- 9999, 999-999-9999. (Note: all of these formats should be

Write the extended regular expression for:

Phone number in any of the following format: 999-(999)9999, 999999- 9999, 999-999-9999.

(Note: all of these formats should be matched by a single regular expression)

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