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  27 <a name="boost_regex.syntax.collating_names.digraphs"></a><a class="link" href="digraphs.html" title="Digraphs">Digraphs</a>
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  29 <p>
  30           The following are treated as valid digraphs when used as a collating name:
  31         </p>
  32 <p>
  33           "ae", "Ae", "AE", "ch", "Ch",
  34           "CH", "ll", "Ll", "LL", "ss",
  35           "Ss", "SS", "nj", "Nj", "NJ",
  36           "dz", "Dz", "DZ", "lj", "Lj",
  37           "LJ".
  38         </p>
  39 <p>
  40           So for example the expression:
  41         </p>
  42 <pre class="programlisting">[[.ae.]-c] </pre>
  43 <p>
  44           will match any character that collates between the digraph "ae"
  45           and the character "c".
  46         </p>
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