Pages tagged form validation

PHP Form Validation Tutorial

Client-side form validations help in giving immediate feedback to the user. It is also required to add server side form validation in your form processing script. The user can disable Javascript on their server or even auto-bots might try to submit your form as well.

The server side form validations help keeping the form submission data consistent. The validations also help in lesser server side errors. For example, if you have set length limit in the database for a text input, it is better to do the validation before it actually gets cut off by the database system or even getting an error thrown.

PHP Form Validation Script

It is very essential to have the input to your form validated before taking the form submission data for further processing. When there are many fields in the form, the PHP validation script becomes too complex. Moreover, since you are doing the same or similar validation for most of the forms that you make, just too much of duplicate effort is spent on form validations.

Note: You can make web forms quickly with Simfatic Forms. Simfatic Forms helps you to make complete, feature rich web forms and get it online quickly. Read more here.

Examples of javascript form validation using regular expressions

In this tutorial you will see how to use regular expressions to validate. Through a list of examples , we will build a script to validate phone numbers , UK postal codes, along with more examples.

First, let’s start by building the webpage and the validation code then we will talk about the regular expressions used to validate the strings. First go to your html file and paste the following code :