* lisp/isearch.el (word-search-regexp): Match whitespace if the search
string begins or ends in whitespace. The LAX arg is applied to both ends of the search string. Use `regexp-quote' and explicit \< and \> instead of \b. Use \` and \' instead of ^ and $. (isearch-symbol-regexp): Sync with `word-search-regexp' where word boundaries are replaced with symbol boundaries, and characters between symbols match non-word non-symbol syntax. Fixes: debbugs:14602
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