Then I created a variable that contains the result of running the test() function on the phone Number string which will be a boolean that contain either true if the string matches our regular expression or false if it does not.
A regular expression can be a single character, or a more complicated pattern.
Regular expressions can be used to perform all types of text search and text replace operations. It searches a string for a specified pattern, and returns the found text as an object.
If no match is found, it returns an empty (null) object.
Validating email address using regular expressions is tricky and is often not recommended. A valid email address as defined by RFC 2822 can be quite complex.
We have different regular expression patterns for validating email address.
So basically the expression tries to match with a phone number like this (541) 754-3010 or like this 541-754-3010 or with spaces Now let’s move on to the Postal code part.
Here I have added a new variable called postal Code to fetch the postal code from the form then created another variable to store the postal code regular expression which we will be discussing in a second.
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 : Here, I have a simple form.