Regular Expressions [Part 4] - Shorthand Character Classes

This video is the fourth in a series on regular expressions, covering various character classes such as word, non-word, digit, non-digit, whitespace, and non-whitespace. It also explores word boundaries and assertions, providing practical examples. The video concludes with a plan to apply these concepts in form validation using regular expressions.

What does the plus symbol (+) signify when used with a word character in regular expressions?

• One or more occurrences

• Exactly one occurrence

• Two or more occurrences

• Zero or more occurrences

Which of the following is NOT considered a word character?

• A space

• A letter

• A number

• An underscore

What does the uppercase 'W' represent in regular expressions?

• Word characters

• Non-word characters

• Whitespace characters

• Non-whitespace characters

Which character class would you use to match any digit?

• \W

• \d

• \D

• \w

What does the lowercase 's' match in regular expressions?

• Whitespace characters

• Non-whitespace characters

• Non-word characters

• Word boundaries

How would you match a word boundary in regular expressions?

• \b

• \B

• \w

• \W

What does the assertion '(?=Y)' mean in regular expressions?

• Match Y only if followed by X

• Match X only if not followed by Y

• Match X only if followed by Y

• Match Y only if not followed by X