Regex to match all us phone number formats in C#

Regex to match all us phone number formats in C#

Here's a regular expression to match all US phone number formats in C#:

Regex phoneRegex = new Regex(@"^(\+1)?[-. ]?\(?\d{3}\)?[-. ]?\d{3}[-. ]?\d{4}$");

This regular expression matches phone numbers in the following formats:

  • (555) 555-5555
  • 555-555-5555
  • 555.555.5555
  • 555 555 5555
  • +1-555-555-5555
  • +1 555 555 5555
  • +15555555555
  • 15555555555

The regular expression breaks down as follows:

  • ^: Matches the beginning of the string.
  • (\+1)?: Optionally matches a plus sign followed by the number 1. This allows for international format numbers that start with +1.
  • [-. ]?: Optionally matches a hyphen, period, or space.
  • \(?\d{3}\)?: Matches a three-digit area code surrounded by optional parentheses. The question marks make the parentheses optional.
  • [-. ]?: Optionally matches a hyphen, period, or space.
  • \d{3}: Matches the next three digits of the phone number.
  • [-. ]?: Optionally matches a hyphen, period, or space.
  • \d{4}: Matches the last four digits of the phone number.
  • $: Matches the end of the string.

To use this regular expression to validate phone numbers in C#, you can use the Match method of the Regex class:

string phoneNumber = "555-555-5555"; if (phoneRegex.IsMatch(phoneNumber)) { Console.WriteLine("Valid phone number."); } else { Console.WriteLine("Invalid phone number."); }

Examples

  1. "C# Regex match standard US phone numbers"

    • Description: Searching for a C# Regex pattern to match standard US phone numbers in various formats.
    • Code:
      string input = "123-456-7890"; string pattern = @"^\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number)

  2. "C# Regex validate US phone number with area code"

    • Description: This query involves validating US phone numbers with area codes using a C# Regex pattern.
    • Code:
      string input = "(555) 123-4567"; string pattern = @"^\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number with area code)

  3. "C# Regex match US phone numbers with optional country code"

    • Description: Seeking a C# Regex pattern to match US phone numbers with or without an optional country code.
    • Code:
      string input = "+1 555-789-0123"; string pattern = @"^\+?1[-.\s]?\d{3}[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number with or without country code)

  4. "C# Regex validate US phone numbers in different formats"

    • Description: This query explores a C# Regex solution to validate US phone numbers in various common formats.
    • Code:
      string input = "555.987.6543"; string pattern = @"^\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number in different formats)

  5. "C# Regex match US mobile phone numbers"

    • Description: Searching for a C# Regex pattern to specifically match US mobile phone numbers in different formats.
    • Code:
      string input = "1 (555) 789-0123"; string pattern = @"^1\s?[-.\s]?\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US mobile phone number)

  6. "C# Regex validate US phone numbers without spaces or symbols"

    • Description: Seeking a C# Regex pattern to validate US phone numbers without any spaces or symbols.
    • Code:
      string input = "1234567890"; string pattern = @"^\(?\d{3}\)?\d{3}\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number without spaces or symbols)

  7. "C# Regex match US phone numbers with optional hyphens"

    • Description: This query aims to find a C# Regex pattern to match US phone numbers with optional hyphens in between digits.
    • Code:
      string input = "555-9876543"; string pattern = @"^\(?\d{3}\)?[-.\s]?(\d{3}[-.\s]?\d{4})$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number with optional hyphens)

  8. "C# Regex validate US phone numbers with or without country code"

    • Description: Seeking a C# Regex pattern to validate US phone numbers with or without an optional country code.
    • Code:
      string input = "1-800-555-1234"; string pattern = @"^\+?1[-.\s]?(\d{3}[-.\s]?\d{3}[-.\s]?\d{4})$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number with or without country code)

  9. "C# Regex match US phone numbers in international format"

    • Description: This query focuses on finding a C# Regex pattern to match US phone numbers in international format.
    • Code:
      string input = "+1 (555) 987-6543"; string pattern = @"^\+\d{1,2}\s?[-.\s]?\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number in international format)

  10. "C# Regex validate US phone numbers with optional parentheses"

    • Description: Seeking a C# Regex pattern to validate US phone numbers with or without optional parentheses around the area code.
    • Code:
      string input = "(555)-987-6543"; string pattern = @"^(\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4})$"; bool isMatch = Regex.IsMatch(input, pattern); // Result: true (for valid US phone number with optional parentheses)

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