Regular expression for validating domain name

Anyway, a-z A-Z precludes characters that are alphabetical from any Unicode region beyond the lower 128. And let's not forget names from languages that have clicks in them, like the ! So in other words, name validation is impossible, as Steven Soroka's referenced article points out.

Use robust sanitization to keep the name from hosing your database or introducing HTML injection vulnerabilities, and that is all.

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Regular expression for validating domain name updating bluetooth bluecore flash using iwrap

It's easy to write one that works 95% of the time, but I'm hoping to get something that's well tested to exactly match the latest RFC specs for DNS hostnames.

Valid Ip Address Regex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"; Valid Hostname Regex = "^(([a-z A-Z0-9]|[a-z A-Z0-9][a-z A-Z0-9\-]*[a-z A-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$"; The original specification of hostnames in RFC 952, mandated that labels could not start with a digit or with a hyphen, and must not end with a hyphen. Before people blindly use this in their code, note that it is not completely accurate.

However, a subsequent specification (RFC 1123) permitted hostname labels to start with digits. - I explain that names that start with a digit are considered as valid as well. It ignores RFC2181: "The DNS itself places only one restriction on the particular labels that can be used to identify resource records. Empty; } regex = '^([0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-5][0-5])[.]([0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-5][0-5])[.]([0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-5][0-5])[.]([0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-5][0-5])$' be flagged as valid regardless of the current preference.

Because the only other online tool I could find for testing .

NET regular expressions was slow and covered with ads, I decided to write a simple AJAX regular expression tester.

I have seen a multitude of regular expressions for different programming languages that all purport to validate email addresses. I have seen many comments saying that the expressions in question do not work for certain cases and that they are either too strict or too permissive. What I'm looking for is a regular expression that I can use in my C# code that is definitive. The best thing I have found is this bool is Email = Regex. Ignore Case); public static bool is Valid Email(string input Email) { string str Regex = @"^([a-z A-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-z A-Z0-9\-]+\" + @".)+))([a-z A-Z]{2,4}|[0-9]{1,3})(\]? That definition wouldn't include the Artist Formerly Known as Prince.

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