Ruby - Regular Expressions
How to write a Ruby regex that matches a string containing only letters and digits, at least one character long?
How to write a Ruby regex that matches a string containing only letters and digits, at least one character long?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand character class for letters and digits
\w matches letters, digits, and underscore. Using [\w]+ matches one or more such characters.Step 2: Use anchors to match entire string
\A and \z anchor start and end of string, ensuring the whole string matches only these characters.Final Answer:
/\A[\w]+\z/ matches strings with only letters and digits, at least one char -> Option DQuick Check:
Anchored \w+ matches letters/digits only [OK]
Quick Trick: Use \A and \z to anchor full string match [OK]
Common Mistakes:
- Using * quantifier allowing empty string
- Not anchoring regex, allowing partial matches
- Using \d+ which matches digits only
Master "Regular Expressions" in Ruby
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