i. Accepts 'book' or 'books' using the '?' quantifier for the 's' to make it optional. ii. Accepts 'colour' or 'color' as they are written. iii. Accepts any positive integer with an optional decimal point using '\d+' for digits, '\.' for decimal point, and '\d*' for optional decimal digits. iv. Checks whether a string is an email address or not using the regex pattern for email addresses.
Interactive Regex Playground
book(s)?|colour|color|\d+\.?\d*|\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}
i. Accepts 'book' or 'books' using the '?' quantifier for the 's' to make it optional. ii. Accepts 'colour' or 'color' as they are written. iii. Accepts any positive integer with an optional decimal point using '\d+' for digits, '\.' for decimal point, and '\d*' for optional decimal digits. iv. Checks whether a string is an email address or not using the regex pattern for email addresses.
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