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Message: [QUOTE="Lachlan Hunt, post: 4898561"] Thanks, I should have got more information about what \b matches. The JavaScript 1.5 Reference only states [1]: | Matches a word boundary, such as a space. (Not to be confused with | [\b].) So I thought it only matched white space or the start/end of the line, I didn't realise it also matched a hyphen and probably other characters too. I replaced the regex with new RegExp("(^|\\s)" + className + "(\\s|$)", flags).test(classNames); It now passes your test cases and all of mine. [1] [URL]http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:RegExp[/URL] [/QUOTE]