What is RegEx Pattern (Regular Expression)? How to use it in Java? Example Attached

Crunchify Java Regular Expression Tutorial What is RegEx Pattern (Regular Expression)? How to use it in Java? Example Attached

What is RegEx: Regular Expression is a search pattern for String. java.util.regex Classes for matching character sequences against patterns specified by regular expressions in Java.

You could use Regex for:

  • Searching Text
  • Extrating Text
  • Modifying Text

Let’s discuss some basic syntax:

Character Classes in Regex:

 Quantifiers in Regex:

Java Split also an Regex example.

Meta Characters in Regex:

Let’s start working on example. In below example we will go over 5 diff Regex Examples.

  1. How to Parse “uptime” command result in Java
  2. Check if URL ends with specific extension
  3. Check if valid IP present
  4. Regex’s ReplaceAll() Example
  5. Find if SSN is valid

Output:

How to validate Password strength using Java Code? Find below my conditions:

 

Result:

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