Allow only alphanumeric in textbox using javascript. allow only Upper Case and Lower Case Alphabet and Number (Digits) characters validation will be performed on Client Side using Model class and Data Annotation attributes in ASP. To achieve this, we can use a RegEx expression that matches all the characters except a number or an alphabet in JavaScript. Approach: Using RegExp A RegExp is used to validate the input. By following the instructions and examples in this guide, you can easily implement this solution in your code and streamline your validation process. <script type="text/ Feb 1, 2019 · In this article I will explain with an example, how to restrict user from entering Special Characters in TextBox using jQuery. We will write code in such a way that the textbox will accept only AlphaNumeric ( Alphabets and Numbers) characters and space character. Aug 27, 2025 · In this article I will explain about the implementation that how to allow only AlphaNumeric character values i. allow only Alphabets and Numbers in TextBox using jQuery. Examples Let’s see some examples of how to use this regular expression to restrict input to alphanumeric characters: Jan 16, 2021 · What is alphanumeric only? 1 : consisting of both letters and numbers and often other symbols (such as punctuation marks and mathematical symbols) an alphanumeric code also : being a character in an alphanumeric system. So far, everyone I try only works if the string is alphanumeric, meaning contains both a letter and a number. b1l5 v9oi dnj tby t4ign qnr ahv 7i5vuqxg cf otw5i5