Named captures in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a named capture group called 'year' in the regex.

Ruby

regex = /(?<[1]>\d{4})/  # Matches a 4-digit year

Drag options to blanks, or click blank then click option'

Adate

Byear

Cmonth

Dday

Attempts:

3 left

💡 Hint

Common Mistakes

Using unnamed capture groups without the ? syntax.

Using incorrect group names like 'date' or 'month' when the pattern matches a year.

The syntax (?pattern) defines a named capture group called 'year' that matches 4 digits.

2fill in blank

medium

Complete the code to access the named capture 'month' from the match data.

Ruby

match = /(?<month>\d{2})/.match('07')
month = match[:[1]]

Drag options to blanks, or click blank then click option'

Amonth

Bdate

Cyear

Dday

Attempts:

3 left

💡 Hint

Common Mistakes

Using string keys instead of symbols.

Using the wrong capture group name.

You access named captures from a MatchData object using symbols like match[:month].

3fill in blank

hard

Fix the error in the code to correctly define and use a named capture 'day'.

Ruby

regex = /(?<[1]>\d{2})/
match = regex.match('15')
day = match[:day]

Drag options to blanks, or click blank then click option'

Amonth

Bdate

Cday

Dyear

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between capture group name and symbol used to access it.

Using an undefined capture group name.

The named capture group must be called 'day' to match the symbol used to access it.

4fill in blank

hard

Fill both blanks to create a regex with named captures 'year' and 'month' and access them.

Ruby

regex = /(?<[1]>\d{4})-(?<[2]>\d{2})/
match = regex.match('2023-06')
year = match[:year]
month = match[:month]

Drag options to blanks, or click blank then click option'

Ayear

Bday

Cmonth

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong capture group names that don't match the symbols used later.

Mixing up the order of year and month.

The regex defines named captures 'year' and 'month' to match the parts of the date string.

5fill in blank

hard

Fill all three blanks to create a regex with named captures 'year', 'month', 'day' and access them.

Ruby

regex = /(?<[1]>\d{4})-(?<[2]>\d{2})-(?<[3]>\d{2})/
match = regex.match('2023-06-15')
year = match[:year]
month = match[:month]
day = match[:day]

Drag options to blanks, or click blank then click option'

Ayear

Bmonth

Cday

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect or inconsistent capture group names.

Not matching the capture group names with the symbols used to access them.

The regex uses named captures 'year', 'month', and 'day' to extract parts of the date string.