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<html>
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     <title>CL Unification: Class REGULAR-EXPRESSION-TEMPLATE</title>
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    <strong><i>CL Unification: Class REGULAR-EXPRESSION-TEMPLATE</title></i></strong>
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  <h1><i>Class</i> <strong>REGULAR-EXPRESSION-TEMPLATE</strong></h1>

  <h2>Package:</h2>

  <p><code>COMMON-LISP.EXTENSIONS.DATA-AND-CONTROL-FLOW.UNIFICATION</code></p>

  <h2>Class Precedence List:</h2>

  <p>
    REGULAR-EXPRESSION-TEMPLATE, STRING-TEMPLATE, VECTOR-TEMPLATE,
    SEQUENCE-TEMPLATE, ARRAY-TEMPLATE, TYPE-TEMPLATE, TEMPLATE,
    STANDARD-OBJECT, T.
  </p>

  <h2>Known Subclasses:</h2>

  <p>
  None.
  </p>

  <h2>Slots:</h2>

  <p>None documented.</p>

  <h2>Description:</h2>

  <p>The REGULAR-EXPRESSION-TEMPLATE class denotes <em>regular
  expressions</em> (the <a
  href="http://weitz.de/cl-ppcre/">CL-PPCRE</a> regular expressions)
  that are used to unify against a STRING.</p>

  <h3>Template Syntax:</h3>

    <p>The spec syntax for a REGULAR-EXPRESSION-TEMPLATE is the
    following:</p>

    <p>
    <pre>
  #T(<b>regular-expression</b> <i>REGEXP</i> &optional <i>unification-vars</i> &rest <i>keys</i>)
  #T(<b>regexp</b> <i>REGEXP</i> &optional <i>unification-vars</i> &rest <i>keys</i>)
    </pre>
    where
    <pre>
  <i>REGEXP</i>           ::= <a <a
    href="http://weitz.de/cl-ppcre/">CL-PPCRE</a> regexp string or tree>
  <i>unification-vars</i> ::= '(' <i>variable</i>* ')'
  <i>keys</i>             ::= <<a
    href="http://weitz.de/cl-ppcre/">CL-PPCRE</a> (constant) keys to be passed to CL-PPCRE:CREATE-SCANNER>
    </pre>
    </p>

    <p><b><code>regular-expression</code></b> and
    <b><code>regexp</code></b> are
    interchangeable. The <code><i>unification-vars</i></code>, if
    present, are unified (i.e., associated) with each group returned
    by the scanner created by CL-PPCRE:CREATE-SCANNER.  The scanner is
    called by the appropriate <a href="unify-function.html">UNIFY</a> method.
    </p>

  <h2>Examples:</h2>

  <p>
  <pre>
  cl-prompt> (unify "abcbca" #T(<b>regexp</b> "a(bc)*a"))
  #<ENVIRONMENT xxx>

  cl-prompt> (unify #T(regexp "a(cb)*a" (?foo)) "acbcba")
  #<ENVIRONMENT xyz>

  cl-prompt> (find-variable-value '?foo *)
  "cb"
  T
  </pre>
  </p>

  <h2>Affected By:</h2>

  <p>None.</p>

  <h2>Exceptional Situations:</h2>

  <p>Unifying an REGULAR-EXPRESSION-TEMPLATE against a non-STRING object results in
  an UNIFICATION-FAILURE error being signaled.</p>

  <h2>See Also:</h2>

  <p><a href="unify-function.html">UNIFY</a></p>

  <h2>Notes:</h2>

  <p>The underlying implementation uses <a
  href="http://weitz.de/cl-ppcre/">CL-PPCRE</a>.</p>

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  © 2003-2013, Marco Antoniotti, all rights reserved.
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