Validate Variable Names According to Naming Conventions in Java

Let's write a Java Program that checks whether a given variable name complies with the naming convention or not using Regular Expressions in Java.

Example for Validating Name of Variable Using Regex

Input: _myName
Output: Correct

Input: 2ndVariable
Output: Incorrect

Regex to Check Variable Name is Valid according to Naming Convention

Below is the implementation to Check Variable Name is Valid according to the Naming Convention:

myVariable123 is valid: true
3rdVariable is valid: false

Explanation of the above Program:

The regular phrase ^[a-zA-Z_$] is the main idea.[a-zA-Z_$0–9]*$ guarantees that the variable name is

• begins with a letter, dollar symbol ($), or underscore (_).
• followed by one or more letter, dollar sign, underscore, or digit occurrences.