Write a regex pattern
Build a regex for any pattern with a breakdown of each part, match/no-match examples, and a ready-to-use helper function. Works for emails, dates, slugs, and more.
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Write a [Language] regex pattern to match [Description, e.g. valid email addresses, ISO 8601 dates, URL slugs]. Break down the pattern by explaining the role of every component, provide a set of example strings that should and should not match, and wrap the pattern in a reusable helper function that applies it and returns the captured groups or null when no match is found.
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