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Test regular expressions for validating phone numbers in multiple formats: E.164 international, US domestic, dashes, spaces, or parentheses.
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For E.164 international format: /^\+[1-9]\d{1,14}$/. For flexible U.S. numbers: /^\+?1?[-.\s]?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$/. Our tester lets you instantly check your pattern against test strings to verify all edge cases before shipping.
E.164 /^\+[1-9]\d{1,14}$/ accepts any country code followed by up to 14 digits. Normalize input first (strip spaces and dashes) before validating.
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