Regex allow hyphen and underscore. Groups, quantifiers, and alternation Regular expres...
Regex allow hyphen and underscore. Groups, quantifiers, and alternation Regular expressions allow groupings indicated by the type of bracket used to enclose the regular expression characters. Hyphen, underscore, space and numbers are optional, but the first and last characters must be letters. Learn how to use regex to allow hyphens in your strings effectively. Below, we’ll delve into several effective methods to perform this input validation in JavaScript, along with practical walkthroughs. Sep 13, 2010 · Generally with hyphen (-) character in regex, its important to note the difference between escaping (\-) and not escaping (-) the hyphen because hyphen apart from being a character themselves are parsed to specify range in regex. If you do use escaping, make it a double backslash, because the regex will be inside a PHP string. You used + for your following characters, meaning one or more, so a one-character string like '_' wouldn't match. malviya govind%malviya 腕錶生活 вкусно-же Dec 1, 2017 · I am having problems creating a regex validator that checks to make sure the input has uppercase or lowercase alphabetical characters, spaces, periods, underscores, and dashes only. Trying to check input against a regular expression. Dec 23, 2013 · A dash at the end of a character class doesn't have any meaning either, so again no need to escape it. . " Nov 26, 2023 · Learn how to write a regular expression to match strings with an unknown number of alphanumeric characters that may or may not have dashes and/or underscores as separators. The following works: Nov 7, 2012 · I am trying to only match a string of letters, numbers, spaces, hyphens, periods, and underscores only and must begin with a letter in a jquery function This is what I came up with after the tutorials but it only accepts letters: Jan 18, 2017 · On the site, a username can consist of letters, numbers, spaces, hyphens, underscores, and periods. Nov 21, 2025 · In this guide, we’ll break down how to build, test, and troubleshoot a robust JavaScript regex for this exact scenario. Jan 3, 2026 · This blog will break down how to create a regex pattern for alphanumeric and underscore validation, explain its components, provide examples in popular programming languages, and highlight common pitfalls to avoid. Nov 23, 2024 · Many developers encounter challenges with regular expression syntax. Nov 17, 2016 · I would like to have a regular expression that checks if the string contains Alphanumerics, Hyphen and Underscore. The field should only allow alphanumeric characters, dashes and underscores and should NOT allow spaces. Dec 3, 2008 · Is there a regular expression which checks if a string contains only upper and lowercase letters, numbers, and underscores? Feb 2, 2013 · I need Regex for english characters, hyphen and underscore Example Match : govind-malviya govind_malviya govind123 govind Not Match govind malviya govind. Detailed examples, common mistakes, and debugging tips included. However, the code below allows spaces. You can apply quantifiers ( *, +, ? ) to the enclosed group and use alternation within the group. You used \w in your first character, which accepted underscores. This appendix describes the regular expressions, special or wildcard special characters as single-character patterns, remove the special meaning combination of letters, digits, and other keyboard characters is a valid regular expression. By the end, you’ll confidently validate inputs to allow only `a-z`, `A-Z`, `0-9`, `-`, and `_`, with no spaces. There should not be any spaces or other special characters other these three. Jul 16, 2012 · print 'yes' Problems in your original regex: | doesn't mean alternation in a character class, it means a pipe character literally. Help me with my regex that only accepts alpha characters, hyphens, and spaces with a minimum of seven characters please Hi I am working with a regex that does what the title says, but it doesn't work if there is a space in the middle of the word My regex: ^ ( [A-Za-z0-9-]) {1,7}$ Word example, delete the double quotes: "-as5- asd" "-50 as 8963. I'm trying to create a javascript regex that allows those characters, but only those characters. Couldn't find Feb 17, 2012 · I am using PHP to replace anything in a string if it is not either a-z, A-Z, 0-9, a comma, a semicolon, an underscore or a hyphen (which ultimately should represent either a single username, or a comma/semicolon separated list of usernames). Jan 21, 2016 · I'm trying to match a string that contains alphanumeric, hyphen, underscore and space. zlkcmbgitsdwodxdywoupavyyakfiaatyyjrhkkhjdlkl