Regex interview questions

Convert any string between camelCase, snake_case, kebab-case, and PascalCase by tokenizing it into words first.

Turn a string into a URL-safe slug: lowercase, strip accents, and collapse non-alphanumeric runs into single hyphens.

Implement replaceAll and matchAll — replace every occurrence of a substring or global pattern, and iterate every match with its capture groups.

Group a number's integer digits with separators — 1234567 to 1,234,567 — handling decimals, negatives, and a custom separator.