How to check LinkedIn web link using RegEx Patterns in Java?

Question

Can anyone help me please? I am working on validation linked in url in java. I create a regular expression(which I am not familiar with) to validate the link however I am struggling with it.

The code is as follows:

public class TestRegEx {

    public static void main(final String[] args) {

        // List of valid URLs
        List<String> validValues = new ArrayList<>();
        validValues.add("https://www.linkedin.com/sometext");
        validValues
                .add("https://uk.linkedin.com/in/wiliam-ferraciolli-a9a29795");
        validValues.add("https://it.linkedin.com/hp/");
        validValues.add("https://cy.linkedin.com/hp/");
        validValues
                .add("https://www.linkedin.com/profile/view?id=AAIAABQnNlYBIx8EtS5T1RTUbxHQt5Ww&trk=nav_responsive_tab_profile");


        // List on invalid URLs
        List<String> invalidValues = new ArrayList<>();
        invalidValues.add("http://www.linkedin.com/sometext");
        invalidValues.add("http://stackoverflow.com/questions/ask");
        invalidValues.add("google.com");
        invalidValues.add("http://uk.linkedin.com/in/someDodgeAddress");
        invalidValues.add("http://dodge.linkedin.com/in/someDodgeAddress");

        // Pattern
        String regex = "(https://)(.+)(www.)(.+)$";
        Pattern pattern = Pattern.compile(regex);

        for (String s : validValues) {
            Matcher matcher = pattern.matcher(s);
            System.out.println(s + " // " + matcher);
        }

    }
}

Can anyone help me to create a regex to validate the following Prefix: "https://" Optional prefix: "uk." (it can be nothing or another country) Middle: "linkedin.com/" Suffix: "any characters with a max of 200 chars"

Regards

Answer 1

I would go with:

^https:\\/\\/[a-z]{2,3}\\.linkedin\\.com\\/.*$

LiveDemo

---

^ assert position at start of a line
https: matches the characters https: literally (case insensitive)
\/ matches the character / literally
\/ matches the character / literally
[a-z]{2,3} match a single character present in the list below

    Quantifier: {2,3} Between 2 and 3 times, as many times as possible, giving back as needed [greedy]
    a-z a single character in the range between a and z (case insensitive)

\. matches the character . literally
linkedin matches the characters linkedin literally (case insensitive)
\. matches the character . literally
com matches the characters com literally (case insensitive)
\/ matches the character / literally
.* matches any character (except newline)

    Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]

$ assert position at end of a line