Ruby - Regular Expressions
What is the output of this Ruby code?
text = "abc123XYZ"
matches = text.scan(/[A-Z]+/)
puts matches.join(",")What is the output of this Ruby code?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the regex /[A-Z]+/ and scan method
The regex matches one or more uppercase letters. The scan method finds all matches in the string.Step 2: Apply regex to the string "abc123XYZ"
Only "XYZ" matches the uppercase pattern. So matches = ["XYZ"]. Joining with comma results in "XYZ".Final Answer:
Output is "XYZ" -> Option BQuick Check:
Uppercase matches = "XYZ" [OK]
Quick Trick: Use scan with [A-Z]+ to find uppercase groups [OK]
Common Mistakes:
- Expecting lowercase or digits to match uppercase regex
- Confusing scan with match (scan returns all matches)
- Joining array incorrectly
Master "Regular Expressions" in Ruby
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