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 :
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.