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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 96 by nigel, Fri Mar 2 13:10:43 2007 UTC
# Line 88  return a non-NULL value before trying to Line 88  return a non-NULL value before trying to
88  <br><a name="SEC3" href="#TOC1">RE-USING A PRECOMPILED PATTERN</a><br>  <br><a name="SEC3" href="#TOC1">RE-USING A PRECOMPILED PATTERN</a><br>
89  <P>  <P>
90  Re-using a precompiled pattern is straightforward. Having reloaded it into main  Re-using a precompiled pattern is straightforward. Having reloaded it into main
91  memory, you pass its pointer to <b>pcre_exec()</b> in the usual way. This should  memory, you pass its pointer to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b> in
92  work even on another host, and even if that host has the opposite endianness to  the usual way. This should work even on another host, and even if that host has
93  the one where the pattern was compiled.  the opposite endianness to the one where the pattern was compiled.
94  </P>  </P>
95  <P>  <P>
96  However, if you passed a pointer to custom character tables when the pattern  However, if you passed a pointer to custom character tables when the pattern
97  was compiled (the <i>tableptr</i> argument of <b>pcre_compile()</b>), you must  was compiled (the <i>tableptr</i> argument of <b>pcre_compile()</b>), you must
98  now pass a similar pointer to <b>pcre_exec()</b>, because the value saved with  now pass a similar pointer to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>,
99  the compiled pattern will obviously be nonsense. A field in a  because the value saved with the compiled pattern will obviously be nonsense. A
100  <b>pcre_extra()</b> block is used to pass this data, as described in the  field in a <b>pcre_extra()</b> block is used to pass this data, as described in
101    the
102  <a href="pcreapi.html#extradata">section on matching a pattern</a>  <a href="pcreapi.html#extradata">section on matching a pattern</a>
103  in the  in the
104  <a href="pcreapi.html"><b>pcreapi</b></a>  <a href="pcreapi.html"><b>pcreapi</b></a>
# Line 114  If you saved study data with the compile Line 115  If you saved study data with the compile
115  <b>pcre_extra</b> data block and set the <i>study_data</i> field to point to the  <b>pcre_extra</b> data block and set the <i>study_data</i> field to point to the
116  reloaded study data. You must also set the PCRE_EXTRA_STUDY_DATA bit in the  reloaded study data. You must also set the PCRE_EXTRA_STUDY_DATA bit in the
117  <i>flags</i> field to indicate that study data is present. Then pass the  <i>flags</i> field to indicate that study data is present. Then pass the
118  <b>pcre_extra</b> block to <b>pcre_exec()</b> in the usual way.  <b>pcre_extra</b> block to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b> in the
119    usual way.
120  </P>  </P>
121  <br><a name="SEC4" href="#TOC1">COMPATIBILITY WITH DIFFERENT PCRE RELEASES</a><br>  <br><a name="SEC4" href="#TOC1">COMPATIBILITY WITH DIFFERENT PCRE RELEASES</a><br>
122  <P>  <P>
123  The layout of the control block that is at the start of the data that makes up  The layout of the control block that is at the start of the data that makes up
124  a compiled pattern was changed for release 5.0. If you have any saved patterns  a compiled pattern was changed for release 5.0. If you have any saved patterns
125  that were compiled with previous releases (not a facility that was previously  that were compiled with previous releases (not a facility that was previously
126  advertised), you will have to recompile them for release 5.0. However, from now  advertised), you will have to recompile them for release 5.0 and above.
 on, it should be possible to make changes in a compabible manner.  
127  </P>  </P>
128  <P>  <P>
129  Last updated: 10 September 2004  If you have any saved patterns in UTF-8 mode that use \p or \P that were
130    compiled with any release up to and including 6.4, you will have to recompile
131    them for release 6.5 and above.
132    </P>
133    <P>
134    All saved patterns from earlier releases must be recompiled for release 7.0 or
135    higher, because there was an internal reorganization at that release.
136    </P>
137    <P>
138    Last updated: 28 November 2006
139  <br>  <br>
140  Copyright &copy; 1997-2004 University of Cambridge.  Copyright &copy; 1997-2006 University of Cambridge.
141  <p>  <p>
142  Return to the <a href="index.html">PCRE index page</a>.  Return to the <a href="index.html">PCRE index page</a>.
143  </p>  </p>

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