What is the regex format for a phone number in Vue 2?

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There is no pre-defined regex format for a phone number in Vue 2. You can use any regular expression that fits your specific requirements and constraints for phone numbers. Here's an example of a regular expression that matches a US phone number with optional area code:

/^\(?(\d{3})\)?[- ]?(\d{3})[- ]?(\d{4})$/

This regex matches phone numbers in the format: 123-456-7890 or (123) 456-7890