 expressions in a Unicode aware environment.
          </p>
<p>
            In order to use this header you will need the <a href="http://www.ibm.com/software/globalization/icu/" target="_top">ICU
            library</a>, and you will need to have built the Boost.Regex library
            with <a class="link" href="../../../install.html#boost_regex.install.building_with_unicode_and_icu_su">ICU
            support enabled</a>.
          </p>
<p>
            The header will enable you to:
          </p>
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