Illustrative structure. The walk visits every term and connector in drawing order; no input is matched or parsed.

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Structural exploration

Paused

ISO date with optional time Railroad diagram of the regular expression (?<year>\d{4})-(?<month>0[1-9]|1[0-2])-(?<day>\d{2})(?:T\d{2}:\d{2})?(?!\d) with 14 terms. It shows structure; it does not match input. ISO date with optional time group year group month group day non-capturing group {4} {2} {2} {2} \d - 0 one of 1-9 1 one of 0-2 - \d T \d : \d negative lookahead ?! \d pattern