Core Java Programming Course- Character Classes in RegEx (regular expressions)

The video tutorial covers character classes in regular expressions, focusing on digit, word, and special characters. It explains the use of escape sequences in Java and demonstrates pattern matching with quantifiers. Practical examples include creating regex patterns for phone numbers and passwords, highlighting the use of non-digit and special character classes.

What does the backslash followed by 'd' represent in regular expressions?

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Explain the difference between '\d' and '\D' in regex.

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How can you represent a whitespace character in regex?

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What is the purpose of using a double backslash in regex patterns?

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How does the quantifier work in regex, particularly in the context of matching a specific number of digits?

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Describe how to create a regex pattern for a phone number starting with '678'.

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What are the requirements for a password pattern that starts with at least 2 word characters and ends with exactly 2 special characters?

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