Regex for hyphen in java Additionally, the POSIX properties in This lesson explains how to use the java. The "-" character may be one of several dashes: the ASCII '-', the em-dash, the en-dash, etc. The backslash (\) escape character turns special characters into string characters: Jul 23, 2013 · -mkyong. Jan 5, 2025 · Regular Expression Quick Reference Cheat Sheet A quick start regex cheat sheet reference guide for regular expressions, including regex syntax, symbols, ranges, grouping, assertions, Unicode handling, and some practical examples. regex package. Learn how to create a regex pattern to match hyphens and commas between characters, ensuring accurate string validation. If mispositioned, the dash might be interpreted as a range operator instead of a literal character. This lesson starts with the basics, and gradually builds to cover more advanced techniques. Introduction Provides a general overview of regular expressions. You should have it outside. What is a Regular Expression? A regular expression is a sequence of characters that forms a search pattern. Currently I am using, ([A-Za-z0-9-]+) which matches letters and numbers. How can I create a Java Regex pattern to match lowercase and uppercase letters, digits, and specific special characters like period, underscore, and hyphen? Jun 17, 2016 · See Regex - Should hyphens be escaped? Because the hyphen is a special character, you have to escape it using the backward slash otherwise it will, as you suggested, denote a range. I have tried: - sample. That's because, you have included the hyphen in the allowed characters in your character class. 10 Useful Java Regular Expression Examples This regex is looking for any string between 3 and 16 characters that starts and ends with a combination of lowercase characters, the numbers 0 – 9, and the special characters of an underscore and a hyphen. matches(regex); but it is not working properly. extension If we want to describe the pattern of an email, we will say something like this: Starting with a username (a combination of letters and numbers), followed by an at @ symbol, followed by the domain Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Dec 11, 2018 · I have a Java program that should match a string if it contains a hyphen for more than 5 times in it: hello-hi-contains-more-than-five-hyphen The words can contain any regular characters. So you it sets a character group that is whitespace pluss the hyphen and looks for instances where that occurs. regex API for pattern matching with regular expressions. For e Feb 21, 2016 · I'm trying to understand dash character - needs to escape using backslash in regex? Consider this: Jan 8, 2024 · To use regular expressions in Java, we don’t need any special setup. Below is the implementation of the above approach: Jul 8, 2025 · Regular expression syntax cheat sheet This page provides an overall cheat sheet of all the capabilities of RegExp syntax by aggregating the content of the articles in the RegExp guide. 0 charclass escapes — meaning \w, \b, \s, \d and their complements — are not in Java extended to work with Unicode. Expert tips and code examples included. Methods: Characters can be escaped in Java Regex in two ways which are listed as follows which we will be Oct 21, 2011 · Writing a simple regex, but I've never been very good at this. DomainUtils. Jul 30, 2025 · The String. Enable less experienced developers to create regex smoothly. Jul 22, 2024 · The regular expressions API in Java, java. The domain name should not start or end with a hyphen (-) (e. When used as a simple character in a character class, it must be escaped by using a backslash ‘\’. if you have a sequence containing spaces and hyphens you don't care what is what - The whole sequence should be replaced with a single space. Results update in real-time as you type. A tool to generate simple regular expressions from sample text. ( ) ^ $ | \ If you want to find one of these metacharacters literally, please add \ before it. com – Cannot end with a hyphen – sub. NET, Rust. Java Regex Alphanumeric Below is a Java regex to match alphanumeric characters. Then one or more digits at the end. Mar 19, 2019 · I’m not a pro in using Regex and can’t figure out why the following behaviour happens, especially if we take into account the difference of matching in Javascript, Java, and Ruby (that’s why I’m a kind of stuck). Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Mar 5, 2019 · This java regex tutorial explains how to match regular expressions against text using Java regex - the Java regular expression API. May 23, 2013 · This is the best answer so far. substring (0, 1) + “-” + string. Detailed examples, common mistakes, and debugging tips included. Mar 26, 2023 · In Java, regular expressions are supported through the java. zmcegm xfcj lxsk wwmm zunt tco vzftx ewgydh wsz ehhlo fugbecsh yjlgdo pez uailx oiawy