[Solved] Given the string "2023-04-01 and 2023-05-01", you want to replace only the month part (the two digits after the first dash) with '12'... Which Ruby code correctly does this using gsub and a regex? | Ruby

Ruby - String Operations

Given the string "2023-04-01 and 2023-05-01", you want to replace only the month part (the two digits after the first dash) with '12' for all dates. Which Ruby code correctly does this using gsub and a regex?

A"2023-04-01 and 2023-05-01".sub(/-(\d{2})-/, '-12-')

B"2023-04-01 and 2023-05-01".gsub(/\d{2}-/, '12-')

C"2023-04-01 and 2023-05-01".gsub(/-(\d{2})-/, '-12-')

D"2023-04-01 and 2023-05-01".gsub(/-\d{2}/, '-12')

Step-by-Step Solution

Solution:

Step 1: Identify the pattern to replace
The month is the two digits between dashes, so the regex -(\d{2})- matches the dash, two digits, then dash.
Step 2: Use gsub to replace all matches
Using gsub with the pattern and replacement '-12-' replaces the month part in all dates.
Final Answer:
"2023-04-01 and 2023-05-01".gsub(/-(\d{2})-/, '-12-') -> Option C
Quick Check:
gsub with regex replaces all month parts correctly [OK]

Quick Trick: Use gsub with regex matching month pattern for all replacements [OK]

Common Mistakes:

Using sub instead of gsub for all matches
Incorrect regex missing dashes
Replacing wrong parts of the string

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Which Ruby code correctly does this using gsub and a regex?

Step 1: Identify the pattern to replace

Step 2: Use `gsub` to replace all matches

Final Answer:

Quick Check:

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