Domain Name Regex, com In this case its "google-" but its ge

Domain Name Regex, com In this case its "google-" but its getting matched and thats an issue for me. Let’s explore the structure and functionality of this regex! Generate regex patterns, test expressions, validate data formats, and extract text with AI. -geeksforgeeks. google. com”, “sitename. Master Domain Name Regex with ease! Learn the ins and outs of regular expressions and level up your web development skills in 2026. I can easily enough find any mismatches to mismatches where “sitename. I recently needed to create some regex which could be used to parse real domain names, and finding a definitive expression seemed to be difficult; especially one that wasn’t vulnerable to ReDoS. com stackoverflow. t. c – Tld must between 2 and 6 long Oct 20, 2021 · 0 I am trying to validate Domain Names using Regex. The domain name should not start or end with a hyphen (-) (e. List of valid domain names www. Nov 9, 2025 · We’ll start by breaking down domain name structure, explore common validation pitfalls, craft a robust regex pattern (including support for subdomains), and learn how to fix errors like invalid characters or excessive length. au g. mkyong. api. )?[A-Za-z0-9-]{1,63}(?<!-)\. mx”. In this tutorial, we will dissect a regex pattern designed to validate domain names. com *. Regular expressions are powerful tools for pattern matching and validation. *)' where . ) and dash(-) We would like to show you a description here but the site won’t allow us. This is my regex : ^((?!-)(\*\. For instance, I have “sitename. )+[A-Za-z0-9-]{1,63} Basically, I don't want to match string ending with "-" before ". domain_name. com mkyong. ca”, and “sitename. mkyong-info. Valid Domain: api. co List of invalid domain names, and why. RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). The domain name should be a-z or A-Z or 0-9 and hyphen (-). " Ex: test. As per requirement, these are my valid and invalid domain names. extension The regular expression should make sure the domain_name can be maximum of 63characters long domain_names can have any letters (can be both lower and upper case), numbers and hyphen. google-. For example, this detects if “sitename. Aug 4, 2012 · Is there a quick and dirty way to validate if the correct FQDN has been entered? Keep in mind there is no DNS server or Internet connection, so validation has to be done via regex/awk/sed. * will ignore all the character before @ (by @+) and start extracting cpmlete domain name by mentioning paranthesis and complete string inside (except linebrake characters) Jun 9, 2021 · I am trying to find if a string has valid domain names or not in JavaScript. Domain name validation regular expressions. com” is not used. A regular expression to match a valid hostname (also called domain label) in DNS entries. NET, Rust. pub456. domain_names cannot start or end with hyphen There should be atleast one domain_name. co mkyong. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Characters should only be a-z | A-Z | 0-9 and period(. I need to validate a domain name: google. g. Jul 12, 2025 · Given string str, the task is to check whether the given string is a valid domain name or not by using Regular Expression. Oct 10, 2021 · Hi all, I am trying to create a regular expression that would detect an exact mismatch of a domain name between source and target. com. *@+(. com google. org or geeksforgeeks. 2 days ago · A practical guide to implementing the three standard domain verification methods: DNS TXT, meta tags, and file-based verification. mkyong. com mkyong123. com sub. org-). . The valid domain name must satisfy the following conditions: Nov 25, 2023 · Domain Name Validation Using RegEx in JavaScript Introduction: Validating user inputs is an essential part of web development to guarantee data security and integrity. Match valid domain names with proper TLD validation. e Explore search trends by time, location, and popularity with Google Trends. com mkyong-info. Aug 15, 2011 · i need canonicalize domain name (fqdn) in hive. 678. The domain name should be between 1 and 63 characters long. A Regular Expression that matches most domains including subdomains and IDN domain names. Test patterns with live matching. Email validation, phone parsing, URL matching, and data extraction - all in a spreadsheet. NET, Java, JavaScript, PCRE, Perl, Python, Ruby Check whether each part of the domain is not longer than 63 characters, and allow internationalized domain names using the punycode notation: Aug 19, 2016 · I used this regular expression to get the complete domain name '. de”, “sitename. de” is used in the Jul 23, 2013 · Note This regular expression pattern should be able to match most of the “real-working” domain names. com So a domain in its rawest form - not even a subdomain like www. Searchable library of common regex patterns for emails, URLs, dates, phone numbers, and more. Note, to use this regex, you will need to convert the domain to lower case, and also use an IDN library to ensure you encode domain names to ACE (also known as "ASCII Compatible Encoding"). Any ideas? Feb 23, 2022 · domain_name. extension or domain_name. go Oct 2, 2025 · Securely Validating Domain Names with Regular Expressions Regular expressions are rarely the solution, but sometimes they can be helpful. Regex options: Case insensitive Regex flavors: . specifically, want to: strip leading all-digit parts (maybe pub ): 123. 6lvy4e, wvjhen, vzjg, 7z8l, i5vbv, xbbf, rs1xl, ikvr, dzctzk, frl3,