#Regex - Guide to Solve different kinds of Problems

In this post, we are going to show you how to solve ʺThe following FormatException was thrown building Builder: Invalid radix-10 numberʺ error in Flutter, this error happens when you are parsing a string to an integer.

In this example, you will learn how to extract or get numbers only from anykind of string in Dart or Flutter. We will use the Regex to extract numbers from string, see the example below:

In this example, we are going to show you how to strip HTML tags from String in Dart/Flutter. Using the example below, you can convert any kind of HTML to String in Flutter.

In this example, we are going to show you the easiest way to validate TextFiled or TextFormField in Flutter App. Validation is very important to retrieve correct data from users. See the example below to validate email, full name, phone number, credit card number, URL, and many more.