"; Solution … - Selection from Regular Expressions Cookbook, 2nd Edition [Book] number_found = patterns.exec(inner_code); //This use of exec() will find the first occurrence only. (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. 2.1. /your_expression/ g). Regular Expressions to Validate Phone Numbers. A2A: How do I give a US phone number internationally? String Formatting. It should include a country calling code or country dial-in code, such as +1 and +44. 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. You want to determine whether a user entered a North American phone number, including the local area code, in a common format. Regular Expression to Matches a string if it is a valid phone number. Validate International Phone Numbers Problem You want to validate international phone numbers. Lastly, the sequence must include a subscriber number (SN), such as 651780. Every number has 3 parts: Country Code (numerical, 2 digit starts with '+') --> +49 Area Code (numerical, min. Then you can use number_found[0] and increment the number between the brackets to return each phone number found. 4. It’ll return an array. 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. Rather than concatenating the strings together, I would use a format string: const string FMT = "{0} is {1} a valid US number. 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. So phone numbers can come in a few different ways, but they should definitely match a certain pattern that pertains to phone numbers. The next element is the national destination code (NDC), such as 7911. I'm trying to create a validation rule for our phone numbers. 1)Phone like +919000000000 (country code)(10 digits) 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. It can match dashes, periods, and spaces as delimiters, country code, and supports parentheses in the area code. 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) . One way that a phone number can come is, 516-111-1111 Another way that a phone number can come is, (516)111-111 These are standard ways to represent phone numbers in the United States and probably elsewhere as well. 4.3. 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. The numbers should start with a plus sign, followed by the country code and national number. To find several phone numbers, add a g to the end of the expression (e.g. I need regular expression for. Conclusion. In total, the example phone number according to … 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. 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