In total, the example phone number according to … /your_expression/ g). Rather than concatenating the strings together, I would use a format string: const string FMT = "{0} is {1} a valid US number. I'm trying to create a validation rule for our phone numbers. Lastly, the sequence must include a subscriber number (SN), such as 651780. Then you can use number_found[0] and increment the number between the brackets to return each phone number found. A2A: How do I give a US phone number internationally? The next element is the national destination code (NDC), such as 7911. Even if you write a regular expression that matches exactly the subset "valid phone numbers" out of strings, there is no way to guarantee (by way of a regular expression) that they are valid mobile phone numbers. The International format for US numbers is: +1-NPA-XXX-XXXX +1 : The PLUS sign is the sign symbolizing International dialing, the “1” is the USA country code. "; You want to determine whether a user entered a North American phone number, including the local area code, in a common format. Ten-Digit Number ... we can use the three expressions in one go, thus allowing us to cover more cases than with just one regular expression. In several countries, mobile phone numbers are indistinguishable from landline phone numbers without at least a number plan lookup, and in some cases, even that won't help. These formats include 1234567890, 123-456-7890, 123.456.7890, 123 456 7890, (123) 456 7890, and all related combinations.If the phone number is valid, you want to convert it to your standard format, (123) 456-7890, so that your phone number records are consistent. It’ll return an array. Solution … - Selection from Regular Expressions Cookbook, 2nd Edition [Book] I would suggest skipping a simple regular expression to test your phone number against, and using a library such as Google's libphonenumber (link to GitHub project) . To find several phone numbers, add a g to the end of the expression (e.g. (note: The MSDN page on Regular Expression Language is always a good reference to check on when coming up with regex patterns in .NET code.) A regular expression is fine for checking the format of a phone number, but it's not really going to be able to check the validity of a phone number. Conclusion. The numbers should start with a plus sign, followed by the country code and national number. So phone numbers can come in a few different ways, but they should definitely match a certain pattern that pertains to phone numbers. 1)Phone like +919000000000 (country code)(10 digits) String Formatting. 2 digit, max 5 digits, cannot start with 0) --> 42; 421; 4218; 42189 Number (numerical, no digit limit, cannot start with 0) Examples: +49 123 1234567 Thanks for help. 4.3. Validate International Phone Numbers Problem You want to validate international phone numbers. 2.1. 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