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The documentation directory has been omitted from this copy of PCRE
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inside the httpd codebase because it's huge--over a megabyte of PCRE docs.
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The PCRE documentation directory is available in unmodified form in the
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vendor branch. You can access it via web browser or Subversion checkout at
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http://svn.apache.org/repos/asf/httpd/httpd/vendor/pcre/current/doc/