Noncapturing group

As explained in The Well-Grounded Rubyist, Fourth Edition

A non-capturing group groups a regular-expression subexpression for matching without storing its text as a numbered capture.

How The Well-Grounded Rubyist, Fourth Edition covers it

How deep it goes

Explains syntax, character consumption, and MatchData capture numbering, contrasting groups with zero-width assertions.

Examples

Demonstrates /(abc) (?:def) (ghi)/ and its two numbered captures in Ruby MatchData.

What it assumes

Assumes regular-expression matching and numbered captures, while clarifying how grouping differs from zero-width assertions.

What you can do after

Apply it in Ruby regular expressions to group matching logic without shifting or storing an unwanted numbered capture.

How it connects

Connects regular-expression grouping with capturing groups, MatchData, and zero-width assertions.

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Also explained in

• 

  liveBookmanning.com
  Regular Expression Puzzles and AI Coding AssistantsA non-capturing group is a parenthesized regular-expression group whose matched text is not stored as a numbered capture.
• 

  liveBookmanning.com
  Secrets of the JavaScript Ninja, Second EditionA regular-expression group that combines subpatterns without recording their matched text as a capture.

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Related concepts

• regex groupingcontrasts with · A regex capturing group is a parenthesized regular-expression subpattern whose matched text is retained for separate access or reference.
• regular expressionused by · A formal pattern notation that describes sets of strings and enables text to be matched, searched, extracted, or transformed.
• negative lookahead assertionalternative to · A negative lookahead assertion is a regular-expression assertion that succeeds when its pattern does not match immediately after the current position without consuming characters.
• assertioncontrasts with · A regular-expression assertion tests a condition at a position in the input without consuming characters as part of the match.
• ChatGPTused by · ChatGPT is OpenAI’s conversational AI service, which lets users interact with generative AI models and related tools through natural-language prompts.

This explainer was generated by Manning's knowledge graph from the text of The Well-Grounded Rubyist, Fourth Edition. The section links point to the parts of the book it draws on.