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revision 197 by ph10, Tue Jul 31 10:50:18 2007 UTC revision 231 by ph10, Tue Sep 11 11:15:33 2007 UTC
# Line 18  man page, in case the conversion went wr Line 18  man page, in case the conversion went wr
18  <li><a name="TOC3" href="#SEC3">UTF-8 SUPPORT</a>  <li><a name="TOC3" href="#SEC3">UTF-8 SUPPORT</a>
19  <li><a name="TOC4" href="#SEC4">UNICODE CHARACTER PROPERTY SUPPORT</a>  <li><a name="TOC4" href="#SEC4">UNICODE CHARACTER PROPERTY SUPPORT</a>
20  <li><a name="TOC5" href="#SEC5">CODE VALUE OF NEWLINE</a>  <li><a name="TOC5" href="#SEC5">CODE VALUE OF NEWLINE</a>
21  <li><a name="TOC6" href="#SEC6">BUILDING SHARED AND STATIC LIBRARIES</a>  <li><a name="TOC6" href="#SEC6">WHAT \R MATCHES</a>
22  <li><a name="TOC7" href="#SEC7">POSIX MALLOC USAGE</a>  <li><a name="TOC7" href="#SEC7">BUILDING SHARED AND STATIC LIBRARIES</a>
23  <li><a name="TOC8" href="#SEC8">HANDLING VERY LARGE PATTERNS</a>  <li><a name="TOC8" href="#SEC8">POSIX MALLOC USAGE</a>
24  <li><a name="TOC9" href="#SEC9">AVOIDING EXCESSIVE STACK USAGE</a>  <li><a name="TOC9" href="#SEC9">HANDLING VERY LARGE PATTERNS</a>
25  <li><a name="TOC10" href="#SEC10">LIMITING PCRE RESOURCE USAGE</a>  <li><a name="TOC10" href="#SEC10">AVOIDING EXCESSIVE STACK USAGE</a>
26  <li><a name="TOC11" href="#SEC11">CREATING CHARACTER TABLES AT BUILD TIME</a>  <li><a name="TOC11" href="#SEC11">LIMITING PCRE RESOURCE USAGE</a>
27  <li><a name="TOC12" href="#SEC12">USING EBCDIC CODE</a>  <li><a name="TOC12" href="#SEC12">CREATING CHARACTER TABLES AT BUILD TIME</a>
28  <li><a name="TOC13" href="#SEC13">SEE ALSO</a>  <li><a name="TOC13" href="#SEC13">USING EBCDIC CODE</a>
29  <li><a name="TOC14" href="#SEC14">AUTHOR</a>  <li><a name="TOC14" href="#SEC14">SEE ALSO</a>
30  <li><a name="TOC15" href="#SEC15">REVISION</a>  <li><a name="TOC15" href="#SEC15">AUTHOR</a>
31    <li><a name="TOC16" href="#SEC16">REVISION</a>
32  </ul>  </ul>
33  <br><a name="SEC1" href="#TOC1">PCRE BUILD-TIME OPTIONS</a><br>  <br><a name="SEC1" href="#TOC1">PCRE BUILD-TIME OPTIONS</a><br>
34  <P>  <P>
# Line 120  Whatever line ending convention is selec Line 121  Whatever line ending convention is selec
121  overridden when the library functions are called. At build time it is  overridden when the library functions are called. At build time it is
122  conventional to use the standard for your operating system.  conventional to use the standard for your operating system.
123  </P>  </P>
124  <br><a name="SEC6" href="#TOC1">BUILDING SHARED AND STATIC LIBRARIES</a><br>  <br><a name="SEC6" href="#TOC1">WHAT \R MATCHES</a><br>
125    <P>
126    By default, the sequence \R in a pattern matches any Unicode newline sequence,
127    whatever has been selected as the line ending sequence. If you specify
128    <pre>
129      --enable-bsr-anycrlf
130    </pre>
131    the default is changed so that \R matches only CR, LF, or CRLF. Whatever is
132    selected when PCRE is built can be overridden when the library functions are
133    called.
134    </P>
135    <br><a name="SEC7" href="#TOC1">BUILDING SHARED AND STATIC LIBRARIES</a><br>
136  <P>  <P>
137  The PCRE building process uses <b>libtool</b> to build both shared and static  The PCRE building process uses <b>libtool</b> to build both shared and static
138  Unix libraries by default. You can suppress one of these by adding one of  Unix libraries by default. You can suppress one of these by adding one of
# Line 130  Unix libraries by default. You can suppr Line 142  Unix libraries by default. You can suppr
142  </pre>  </pre>
143  to the <b>configure</b> command, as required.  to the <b>configure</b> command, as required.
144  </P>  </P>
145  <br><a name="SEC7" href="#TOC1">POSIX MALLOC USAGE</a><br>  <br><a name="SEC8" href="#TOC1">POSIX MALLOC USAGE</a><br>
146  <P>  <P>
147  When PCRE is called through the POSIX interface (see the  When PCRE is called through the POSIX interface (see the
148  <a href="pcreposix.html"><b>pcreposix</b></a>  <a href="pcreposix.html"><b>pcreposix</b></a>
# Line 146  such as Line 158  such as
158  </pre>  </pre>
159  to the <b>configure</b> command.  to the <b>configure</b> command.
160  </P>  </P>
161  <br><a name="SEC8" href="#TOC1">HANDLING VERY LARGE PATTERNS</a><br>  <br><a name="SEC9" href="#TOC1">HANDLING VERY LARGE PATTERNS</a><br>
162  <P>  <P>
163  Within a compiled pattern, offset values are used to point from one part to  Within a compiled pattern, offset values are used to point from one part to
164  another (for example, from an opening parenthesis to an alternation  another (for example, from an opening parenthesis to an alternation
# Line 162  to the <b>configure</b> command. The val Line 174  to the <b>configure</b> command. The val
174  longer offsets slows down the operation of PCRE because it has to load  longer offsets slows down the operation of PCRE because it has to load
175  additional bytes when handling them.  additional bytes when handling them.
176  </P>  </P>
177  <br><a name="SEC9" href="#TOC1">AVOIDING EXCESSIVE STACK USAGE</a><br>  <br><a name="SEC10" href="#TOC1">AVOIDING EXCESSIVE STACK USAGE</a><br>
178  <P>  <P>
179  When matching with the <b>pcre_exec()</b> function, PCRE implements backtracking  When matching with the <b>pcre_exec()</b> function, PCRE implements backtracking
180  by making recursive calls to an internal function called <b>match()</b>. In  by making recursive calls to an internal function called <b>match()</b>. In
# Line 193  perform better than <b>malloc()</b> and Line 205  perform better than <b>malloc()</b> and
205  slowly when built in this way. This option affects only the <b>pcre_exec()</b>  slowly when built in this way. This option affects only the <b>pcre_exec()</b>
206  function; it is not relevant for the the <b>pcre_dfa_exec()</b> function.  function; it is not relevant for the the <b>pcre_dfa_exec()</b> function.
207  </P>  </P>
208  <br><a name="SEC10" href="#TOC1">LIMITING PCRE RESOURCE USAGE</a><br>  <br><a name="SEC11" href="#TOC1">LIMITING PCRE RESOURCE USAGE</a><br>
209  <P>  <P>
210  Internally, PCRE has a function called <b>match()</b>, which it calls repeatedly  Internally, PCRE has a function called <b>match()</b>, which it calls repeatedly
211  (sometimes recursively) when matching a pattern with the <b>pcre_exec()</b>  (sometimes recursively) when matching a pattern with the <b>pcre_exec()</b>
# Line 222  constraints. However, you can set a lowe Line 234  constraints. However, you can set a lowe
234  </pre>  </pre>
235  to the <b>configure</b> command. This value can also be overridden at run time.  to the <b>configure</b> command. This value can also be overridden at run time.
236  </P>  </P>
237  <br><a name="SEC11" href="#TOC1">CREATING CHARACTER TABLES AT BUILD TIME</a><br>  <br><a name="SEC12" href="#TOC1">CREATING CHARACTER TABLES AT BUILD TIME</a><br>
238  <P>  <P>
239  PCRE uses fixed tables for processing characters whose code values are less  PCRE uses fixed tables for processing characters whose code values are less
240  than 256. By default, PCRE is built with a set of tables that are distributed  than 256. By default, PCRE is built with a set of tables that are distributed
# Line 239  compiling, because <b>dftables</b> is ru Line 251  compiling, because <b>dftables</b> is ru
251  create alternative tables when cross compiling, you will have to do so "by  create alternative tables when cross compiling, you will have to do so "by
252  hand".)  hand".)
253  </P>  </P>
254  <br><a name="SEC12" href="#TOC1">USING EBCDIC CODE</a><br>  <br><a name="SEC13" href="#TOC1">USING EBCDIC CODE</a><br>
255  <P>  <P>
256  PCRE assumes by default that it will run in an environment where the character  PCRE assumes by default that it will run in an environment where the character
257  code is ASCII (or Unicode, which is a superset of ASCII). This is the case for  code is ASCII (or Unicode, which is a superset of ASCII). This is the case for
# Line 252  to the <b>configure</b> command. This se Line 264  to the <b>configure</b> command. This se
264  --enable-rebuild-chartables. You should only use it if you know that you are in  --enable-rebuild-chartables. You should only use it if you know that you are in
265  an EBCDIC environment (for example, an IBM mainframe operating system).  an EBCDIC environment (for example, an IBM mainframe operating system).
266  </P>  </P>
267  <br><a name="SEC13" href="#TOC1">SEE ALSO</a><br>  <br><a name="SEC14" href="#TOC1">SEE ALSO</a><br>
268  <P>  <P>
269  <b>pcreapi</b>(3), <b>pcre_config</b>(3).  <b>pcreapi</b>(3), <b>pcre_config</b>(3).
270  </P>  </P>
271  <br><a name="SEC14" href="#TOC1">AUTHOR</a><br>  <br><a name="SEC15" href="#TOC1">AUTHOR</a><br>
272  <P>  <P>
273  Philip Hazel  Philip Hazel
274  <br>  <br>
# Line 265  University Computing Service Line 277  University Computing Service
277  Cambridge CB2 3QH, England.  Cambridge CB2 3QH, England.
278  <br>  <br>
279  </P>  </P>
280  <br><a name="SEC15" href="#TOC1">REVISION</a><br>  <br><a name="SEC16" href="#TOC1">REVISION</a><br>
281  <P>  <P>
282  Last updated: 30 July 2007  Last updated: 11 September 2007
283  <br>  <br>
284  Copyright &copy; 1997-2007 University of Cambridge.  Copyright &copy; 1997-2007 University of Cambridge.
285  <br>  <br>

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