Word boundary matching in Javascript [duplicate]

This question already has answers here: What is a word boundary in regex? 开发者_运维百科 (13 answers) Closed 4 years ago.

This Regex Pattern: \bgoogle\b

Test case: http://www.google.com/

It matches.

Why?

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Because a period represents a word boundary. That is, it is not part of a word, just as a space, a colon, a semicolon, or a tab character are not part of a word. \b is a zero-width assertion, meaning it does not match anything itself, it just defines something about the match.

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Word boundaries with \b are very tricksy buggers indeed!