[Solved] Why does scan return only the last match when using a regex with capturing groups? — Ans: Because scan returns an array of capture groups, each as an array | Ruby

Ruby - Regular Expressions

Why does scan return only the last match when using a regex with capturing groups?

ABecause scan only works without groups

BBecause scan ignores all but the last match

CBecause scan returns a string, not an array

DBecause scan returns an array of capture groups, each as an array

Step-by-Step Solution

Solution:

Step 1: Understand scan with capturing groups
When regex has groups, scan returns an array of arrays, each inner array has group matches.
Step 2: Clarify why last match confusion occurs
If you access only one element, it may seem like last match only, but scan returns all matches grouped.
Final Answer:
Because scan returns an array of capture groups, each as an array -> Option D
Quick Check:
scan with groups returns array of arrays = D [OK]

Quick Trick: scan with groups returns array of arrays, not single string [OK]

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Why does scan return only the last match when using a regex with capturing groups?