Regex - Interview Questions and Answers for 'Regex' | Search Interview Question

Regex - Interview Questions and Answers for 'Regex' - 4 question(s) found - Order By Newest

Q1. What's wrong with this code ?

public static void main(String[] args) {
String regex = "(\\w+)*";
String s = "Java is a programming language.";

Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(s);
while (matcher.next()) {
System.out.println("The e-mail id is: " + matcher.group());
}
}

Core Java

Ans. matcher.find() should have been used instead of matcher.next() within while.

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Q2. Can you write a regex pattern that would validate if the word starts with a capital alphabet and then alphanumeric thereafter.

Regex

Ans. ^[A-Z][a-z,A-Z,0-9]*$

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Q3. Write a regex pattern that would validate if the word starts with a alphabet and then alphanumeric thereafter or few special characters (let's say . and _ ).

Regex

Ans. ^[a-z,A-Z][a-z,A-Z,0-9,._]*$

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Q4. Write a regex pattern that would validate if the sting has only alphanumeric characters and no consecutive spaces.

Regex

Ans. ^([a-z,A-Z,0-9]*[ ]+)*$

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