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  2. Difference between \b and \B in regex - Stack Overflow

    stackoverflow.com/questions/6664151

    \b is a zero-width word boundary. Specifically: Matches at the position between a word character (anything matched by \w) and a non-word character (anything matched by [^\w] or \W) as well as at the start and/or end of the string if the first and/or last characters in the string are word characters.

  3. PNG Specification: Chunk Specifications - libpng.org

    www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html

    However, application authors are encouraged to use those chunk types whenever appropriate for their applications. Additional chunk types can be proposed for inclusion in that list by contacting the PNG specification maintainers at png-info@uunet.uu.net or at png-group@w3.org.