Technical…Practical…Theoretical…
Introduction This tutorial will show you how to validate email address with regular expression using Kotlin. In this post, email validation in Kotlin will be done using regular expression or regex pattern. In web applications or standalone applications where we need to…
This tutorial will show you how to solve HackerRank Valid Username Checker using Kotlin. In different web applications we define certain rules for choosing the username, such as, it should consists of maximum 30 characters; it should not have any special character;…
Introduction In my previous tutorial I have shown how to validate input data coming from client or end user to Spring REST Controller. Now in this tutorial I will show you how to validate data in Spring Service Layer. The reason behind…
In this example, I will show you how to build a bean validator for User model object.In my previous example, Spring MVC Custom Validator, I have shown how to validate user input. Validating input received from the user to maintain data integrity is…
In this example, I will show you how to build a custom validator for User model object. This validator is custom implementation of Validator interface. Spring MVC supports validation by means of a validator object that implements the Validator interface. I will…
Introduction Given JSON-like content, convert it to valid JSON! The OWASP JSON Sanitizer Project is a simple to use Java library that can be attached at either end of a data-pipeline to help satisfy Postel’s principle: be conservative in what you do,…
This tutorial will show you some validations we require in most of the cases. These are given below one by one. 1. Check if an email address is injected //validate against any email injection attempts function is_email_injected($email) { $injections = array(‘(\n+)’, ‘(\r+)’,…
This is an example on how to verify a string only contains integer values. String may contain anything like float value, double value, characters etc. This example uses regular expression to check a string contains only int values. Below is the function…
Introduction The example – allow only numeric values or digits in a textbox using javascript or jquery – shows how to accept only numbers or digits in a textbox or input field using JavaScript or jQuery. Sometimes we need to accept only…
This tutorial shows how to allow only specific file types to be uploaded to the server. In this example I have shown how to allow only Microsoft word document and pdf file types. You can add more file types here. We need…