* doc: Recommend putting '-' as last char in Emacs charset regexps
* doc/lispref/searching.texi (Regexp Special): * doc/emacs/search.texi (Regexps): Recommend - as last char in [...].
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* doc/lispref/searching.texi (Regexp Special): * doc/emacs/search.texi (Regexps): Recommend - as last char in [...].