Ruby - Regular Expressions
Given a string containing dates in format "YYYY-MM-DD", how would you replace all dashes with slashes only if the year starts with "202"?
Given a string containing dates in format "YYYY-MM-DD", how would you replace all dashes with slashes only if the year starts with "202"?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the regex with capture group
The pattern/(202\d)-/captures years starting with 202 and a digit, followed by a dash.Step 2: Replace dash with slash preserving year
Using '\1/' replaces the dash with slash, keeping the year intact.Final Answer:
str.gsub(/(202\d)-/, '\1/') -> Option CQuick Check:
Use capture groups to keep parts and replace selectively [OK]
Quick Trick: Use parentheses to capture and reuse parts in replacement [OK]
Common Mistakes:
- Replacing entire date instead of just dash
- Not using capture groups to keep year
- Replacing wrong parts of string
Master "Regular Expressions" in Ruby
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