Git URLs typically follow a specific pattern, with variations depending on the protocol and repository hosting service. Some common Git URL patterns include:

1. https protocol with the github.com hosting service: https://github.com/username/repository.git

2. https protocol with a generic Git hosting service: https://git.example.com/username/repository.git

3. git protocol with the github.com hosting service: git://github.com/username/repository.git

To match these patterns using regular expressions in Java, we can use the Pattern and Matcher classes from the java.util.regex package. Let’s take a look at how we can do this for each pattern.

Pattern 1: https protocol with the github.com hosting service

String urlPattern1 = "^https://github.com/[a-zA-Z0-9_-]+/[a-zA-Z0-9_-]+\\.git$";

Explanation:

• ^ and $ represents the start and end of the line.
• [a-zA-Z0-9_-] matches any alphanumeric character and _ or -.
• + matches one or more occurrences of the previous expression.
• \\.git matches the literal characters .git.

Pattern 2: https protocol with a generic Git hosting service

String urlPattern2 = "^https://[a-zA-Z0-9.-]+/[a-zA-Z0-9_-]+/[a-zA-Z0-9_-]+\\.git$";

Explanation:

• [a-zA-Z0-9.-] matches any alphanumeric character, . or -.
• ^https:// matches the literal characters https://.

Pattern 3: git protocol with the github.com hosting service

String urlPattern3 = "^git://github.com/[a-zA-Z0-9_-]+/[a-zA-Z0-9_-]+\\.git$";

Explanation:

• ^git:// matches the literal characters git://.

Once we have defined our patterns, we can use the Matcher.matches() method to check if a given URL matches the pattern.

String gitUrl = "https://github.com/username/repository.git";

if (gitUrl.matches(urlPattern1)) {
    System.out.println("Pattern 1 matched!");
}

By using regular expressions in Java, we can easily match specific Git URL patterns and perform further operations based on the matching results. Remember to customize the patterns according to your specific needs.

#regex #java