        <span class="phrase"><a name="boost_regex.syntax.basic_extended.escapes_matching_a_specific_char"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.escapes_matching_a_specific_char">Escapes
        matching a specific character</a>
      </h6>
<p>
        The following escape sequences are all synonyms for single characters:
      </p>
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