The next element is the national destination code (NDC), such as 7911. 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. 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. Lastly, the sequence must include a subscriber number (SN), such as 651780. String Formatting. To find several phone numbers, add a g to the end of the expression (e.g. A2A: How do I give a US phone number internationally? I'm trying to create a validation rule for our phone numbers. Rather than concatenating the strings together, I would use a format string: const string FMT = "{0} is {1} a valid US number. 4. I need regular expression for. Then you can use number_found[0] and increment the number between the brackets to return each phone number found. 1)Phone like +919000000000 (country code)(10 digits) It should include a country calling code or country dial-in code, such as +1 and +44. 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. /your_expression/ 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.) Regular Expressions to Validate Phone Numbers. "; 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. You want to determine whether a user entered a North American phone number, including the local area code, in a common format. 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. number_found = patterns.exec(inner_code); //This use of exec() will find the first occurrence only. Conclusion. In total, the example phone number according to … 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) . 4.3. It can match dashes, periods, and spaces as delimiters, country code, and supports parentheses in the area code. 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. 2.1. 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. Regular Expression to Matches a string if it is a valid phone number. 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. Every number has 3 parts: Country Code (numerical, 2 digit starts with '+') --> +49 Area Code (numerical, min. Validate International Phone Numbers Problem You want to validate international phone numbers. 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. 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