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

    \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 -

    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 or at