I knew what a numeronym was which helped, but I second-guessed myself on the edge cases.
Clarify the definition of a numeronym: a string that starts with a letter, ends with a letter, and contains a number in between that represents the count of omitted characters. Then implement a validation function that checks these conditions, handling edge cases like single-letter strings, multiple numbers, and non-alphanumeric characters.
Pro tip: Discuss how to handle Unicode letters and whether the number should be a positive integer without leading zeros, showing attention to detail and real-world robustness.
Ask the interviewer to confirm the exact rules for a valid numeronym, such as whether the number must be greater than 0, whether leading zeros are allowed, and if only ASCII letters are considered.
Formalize the conditions: the string must have at least 3 characters, start and end with a letter, and contain exactly one numeric sequence in the middle that represents the count of omitted characters.
Write a function that iterates through the string or uses regular expressions to check the pattern, ensuring that the numeric part is a valid positive integer and that no other characters are present.
Validate the function with examples like 'i18n' (valid), 'k8s' (valid), 'a1b' (valid), '1abc' (invalid), 'abc' (invalid), 'a0b' (invalid), and 'a12b3c' (invalid).
State that the time complexity is O(n) where n is the length of the string, and space complexity is O(1) if using iterative checks.
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