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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC
# Line 197  Because of this phenomenon, it does not Line 197  Because of this phenomenon, it does not
197  that is going to be matched in this way with a variable repeat.  that is going to be matched in this way with a variable repeat.
198  </P>  </P>
199  <P>  <P>
200  Last updated: 28 February 2005  4. Patterns that contain alternatives at the top level which do not all
201    start with the same pattern item may not work as expected. For example,
202    consider this pattern:
203    <pre>
204      1234|3789
205    </pre>
206    If the first part of the subject is "ABC123", a partial match of the first
207    alternative is found at offset 3. There is no partial match for the second
208    alternative, because such a match does not start at the same point in the
209    subject string. Attempting to continue with the string "789" does not yield a
210    match because only those alternatives that match at one point in the subject
211    are remembered. The problem arises because the start of the second alternative
212    matches within the first alternative. There is no problem with anchored
213    patterns or patterns such as:
214    <pre>
215      1234|ABCD
216    </pre>
217    where no string can be a partial match for both alternatives.
218    </P>
219    <P>
220    Last updated: 16 January 2006
221  <br>  <br>
222  Copyright &copy; 1997-2005 University of Cambridge.  Copyright &copy; 1997-2006 University of Cambridge.
223  <p>  <p>
224  Return to the <a href="index.html">PCRE index page</a>.  Return to the <a href="index.html">PCRE index page</a>.
225  </p>  </p>
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