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