version 1.1.1.2, 2012/02/21 23:50:25
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version 1.1.1.5, 2014/06/15 19:46:05
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Line 21 practice be relevant.
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Line 21 practice be relevant.
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<P> |
<P> |
The maximum length of a compiled pattern is approximately 64K data units (bytes |
The maximum length of a compiled pattern is approximately 64K data units (bytes |
for the 8-bit library, 16-bit units for the 16-bit library) if PCRE is compiled | for the 8-bit library, 16-bit units for the 16-bit library, and 32-bit units for |
with the default internal linkage size of 2 bytes. If you want to process | the 32-bit library) if PCRE is compiled with the default internal linkage size, |
regular expressions that are truly enormous, you can compile PCRE with an | which is 2 bytes for the 8-bit and 16-bit libraries, and 4 bytes for the 32-bit |
internal linkage size of 3 or 4 (when building the 16-bit library, 3 is rounded | library. If you want to process regular expressions that are truly enormous, |
up to 4). See the <b>README</b> file in the source 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. |
Line 35 All values in repeating quantifiers must be less than
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Line 37 All values in repeating quantifiers must be less than
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<P> |
There is no limit to the number of parenthesized subpatterns, but there can be |
There is no limit to the number of parenthesized subpatterns, but there can be |
no more than 65535 capturing subpatterns. | no more than 65535 capturing subpatterns. There is, however, a limit to the |
| depth of nesting of parenthesized subpatterns of all kinds. This is imposed in |
| order to limit the amount of system stack used at compile time. The limit can |
| be specified when PCRE is built; the default is 250. |
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<P> |
There is a limit to the number of forward references to subsequent subpatterns |
There is a limit to the number of forward references to subsequent subpatterns |
Line 48 The maximum length of name for a named subpattern is 3
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Line 53 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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</P> |
<P> |
<P> |
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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 libraries. |
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<P> |
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 72 Cambridge CB2 3QH, England.
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Line 81 Cambridge CB2 3QH, England.
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REVISION |
REVISION |
</b><br> |
</b><br> |
<P> |
<P> |
Last updated: 08 January 2012 | Last updated: 05 November 2013 |
<br> |
<br> |
Copyright © 1997-2012 University of Cambridge. | Copyright © 1997-2013 University of Cambridge. |
<br> |
<br> |
<p> |
<p> |
Return to the <a href="index.html">PCRE index page</a>. |
Return to the <a href="index.html">PCRE index page</a>. |