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revision 148 by ph10, Mon Apr 16 13:25:10 2007 UTC revision 345 by ph10, Mon Apr 28 15:10:02 2008 UTC
# Line 148  not supported, and cause errors if encou Line 148  not supported, and cause errors if encou
148  condition or test for a specific group recursion are not supported.  condition or test for a specific group recursion are not supported.
149  </P>  </P>
150  <P>  <P>
151  5. Callouts are supported, but the value of the <i>capture_top</i> field is  5. Because many paths through the tree may be active, the \K escape sequence,
152    which resets the start of the match when encountered (but may be on some paths
153    and not on others), is not supported. It causes an error if encountered.
154    </P>
155    <P>
156    6. Callouts are supported, but the value of the <i>capture_top</i> field is
157  always 1, and the value of the <i>capture_last</i> field is always -1.  always 1, and the value of the <i>capture_last</i> field is always -1.
158  </P>  </P>
159  <P>  <P>
160  6.  7. The \C escape sequence, which (in the standard algorithm) matches a single
 The \C escape sequence, which (in the standard algorithm) matches a single  
161  byte, even in UTF-8 mode, is not supported because the alternative algorithm  byte, even in UTF-8 mode, is not supported because the alternative algorithm
162  moves through the subject string one character at a time, for all active paths  moves through the subject string one character at a time, for all active paths
163  through the tree.  through the tree.
164  </P>  </P>
165    <P>
166    8. Except for (*FAIL), the backtracking control verbs such as (*PRUNE) are not
167    supported. (*FAIL) is supported, and behaves like a failing negative assertion.
168    </P>
169  <br><a name="SEC5" href="#TOC1">ADVANTAGES OF THE ALTERNATIVE ALGORITHM</a><br>  <br><a name="SEC5" href="#TOC1">ADVANTAGES OF THE ALTERNATIVE ALGORITHM</a><br>
170  <P>  <P>
171  Using the alternative matching algorithm provides the following advantages:  Using the alternative matching algorithm provides the following advantages:
# Line 207  Cambridge CB2 3QH, England. Line 215  Cambridge CB2 3QH, England.
215  </P>  </P>
216  <br><a name="SEC8" href="#TOC1">REVISION</a><br>  <br><a name="SEC8" href="#TOC1">REVISION</a><br>
217  <P>  <P>
218  Last updated: 06 March 2007  Last updated: 19 April 2008
219  <br>  <br>
220  Copyright &copy; 1997-2007 University of Cambridge.  Copyright &copy; 1997-2008 University of Cambridge.
221  <br>  <br>
222  <p>  <p>
223  Return to the <a href="index.html">PCRE index page</a>.  Return to the <a href="index.html">PCRE index page</a>.

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