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

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Structural exploration

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Version capture Railroad diagram of the regular expression (?=v)(?<version>v\d+(?:\.\d+){1,2})(?![\w.]) with 8 terms. It shows structure; it does not match input. Version capture group version non-capturing group {1,2} lookahead ?= v v \d . \d negative lookahead ?! one of \w . pattern