Regex: Actually Useful Patterns
Groups and Capturing/Assessment
Practice & Assessment
Test your understanding of Groups and Capturing
Multiple Choice Questions
51
Given '2024-06-15'.match(/(\d{4})-(\d{2})-(\d{2})/), what is m[2]?
2
What is the purpose of (?:pattern) in a regex?
3
What does \1 refer to in a regex pattern?
4
Why does 'abc'.match(/[a-z]/g) return ['a','b','c'] but 'abc'.match(/[a-z]/) returns only ['a']?
5
What is the JavaScript syntax for a named capture group that captures a year?
Coding Challenges
11
EasyDate Format Converter
Write a function reformatDates(text) that finds all dates in YYYY-MM-DD format in a string and returns the string with those dates rewritten as DD/MM/YYYY.
Mini Project
1
MediumLog Line Parser
Build a function parseLogLine(line) that uses named capture groups to parse a structured log line.