Ruby - Regular Expressions
How can you use the
match method to check if a string contains only digits and extract them?How can you use the match method to check if a string contains only digits and extract them?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Use regex to match entire string of digits
The regex/^\d+$/ensures the whole string contains only digits.Step 2: Extract matched digits safely
Ifmis not nil,m[0]contains the digits.Final Answer:
m = str.match(/^\d+$/); digits = m[0] if m -> Option AQuick Check:
Use anchors ^$ to match whole string digits = B [OK]
Quick Trick: Use ^ and $ anchors to match entire string [OK]
Common Mistakes:
- Using partial match regex
- Accessing wrong group index
- Not checking for nil
Master "Regular Expressions" in Ruby
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