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version 1.1.1.4, 2013/07/22 08:25:57
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Line 20 There are some size limitations in PCRE but it is hope
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Line 20 There are some size limitations in PCRE but it is hope
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practice be relevant. |
practice be relevant. |
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<P> |
<P> |
The maximum length of a compiled pattern is 65539 (sic) bytes if PCRE is | The maximum length of a compiled pattern is approximately 64K data units (bytes |
compiled with the default internal linkage size of 2. If you want to process | for the 8-bit library, 32-bit units for the 32-bit library, and 32-bit units for |
regular expressions that are truly enormous, you can compile PCRE with an | the 32-bit library) if PCRE is compiled with the default internal linkage size |
internal linkage size of 3 or 4 (see the <b>README</b> file in the source | of 2 bytes. If you want to process regular expressions that are truly enormous, |
distribution and the | you can compile PCRE with an internal linkage size of 3 or 4 (when building the |
| 16-bit or 32-bit library, 3 is rounded up to 4). See the <b>README</b> file in |
| the source distribution and the |
<a href="pcrebuild.html"><b>pcrebuild</b></a> |
<a href="pcrebuild.html"><b>pcrebuild</b></a> |
documentation for details). In these cases the limit is substantially larger. | documentation for details. In these cases the limit is substantially larger. |
However, the speed of execution is slower. |
However, the speed of execution is slower. |
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Line 47 The maximum length of name for a named subpattern is 3
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Line 49 The maximum length of name for a named subpattern is 3
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maximum number of named subpatterns is 10000. |
maximum number of named subpatterns is 10000. |
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The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb |
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is 255 for the 8-bit library and 65535 for the 16-bit and 32-bit library. |
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The maximum length of a subject string is the largest positive number that an |
The maximum length of a subject string is the largest positive number that an |
integer variable can hold. However, when using the traditional matching |
integer variable can hold. However, when using the traditional matching |
function, PCRE uses recursion to handle subpatterns and indefinite repetition. |
function, PCRE uses recursion to handle subpatterns and indefinite repetition. |
Line 71 Cambridge CB2 3QH, England.
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Line 77 Cambridge CB2 3QH, England.
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REVISION |
REVISION |
</b><br> |
</b><br> |
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<P> |
Last updated: 30 November 2011 | Last updated: 04 May 2012 |
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<br> |
Copyright © 1997-2011 University of Cambridge. | Copyright © 1997-2012 University of Cambridge. |
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<p> |
<p> |
Return to the <a href="index.html">PCRE index page</a>. |
Return to the <a href="index.html">PCRE index page</a>. |