Word-Boundary Pattern Anchors
\b and \B, specify whether a matched pattern must be on a word boundary or inside a word boundary.
The \b pattern anchor specifies that the pattern must be on a word boundary.
/\bdef/ matches only if def is the beginning of a word.
\b to indicate the end of a word.
/def\b/ matches def and abcdef
/\bdef\b/ matches only the word def.
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