21 |
</P> |
</P> |
22 |
<P> |
<P> |
23 |
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 |
24 |
for the 8-bit library, 32-bit units for the 32-bit library, and 32-bit units for |
for the 8-bit library, 16-bit units for the 16-bit library, and 32-bit units for |
25 |
the 32-bit library) if PCRE is compiled with the default internal linkage size |
the 32-bit library) if PCRE is compiled with the default internal linkage size, |
26 |
of 2 bytes. If you want to process regular expressions that are truly enormous, |
which is 2 bytes for the 8-bit and 16-bit libraries, and 4 bytes for the 32-bit |
27 |
|
library. If you want to process regular expressions that are truly enormous, |
28 |
you can compile PCRE with an internal linkage size of 3 or 4 (when building the |
you can compile PCRE with an internal linkage size of 3 or 4 (when building the |
29 |
16-bit or 32-bit library, 3 is rounded up to 4). See the <b>README</b> file in |
16-bit or 32-bit library, 3 is rounded up to 4). See the <b>README</b> file in |
30 |
the source distribution and the |
the source distribution and the |
37 |
</P> |
</P> |
38 |
<P> |
<P> |
39 |
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 |
40 |
no more than 65535 capturing subpatterns. |
no more than 65535 capturing subpatterns. There is, however, a limit to the |
41 |
|
depth of nesting of parenthesized subpatterns of all kinds. This is imposed in |
42 |
|
order to limit the amount of system stack used at compile time. The limit can |
43 |
|
be specified when PCRE is built; the default is 250. |
44 |
</P> |
</P> |
45 |
<P> |
<P> |
46 |
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 |
54 |
</P> |
</P> |
55 |
<P> |
<P> |
56 |
The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb |
The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb |
57 |
is 255 for the 8-bit library and 65535 for the 16-bit and 32-bit library. |
is 255 for the 8-bit library and 65535 for the 16-bit and 32-bit libraries. |
58 |
</P> |
</P> |
59 |
<P> |
<P> |
60 |
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 |
81 |
REVISION |
REVISION |
82 |
</b><br> |
</b><br> |
83 |
<P> |
<P> |
84 |
Last updated: 04 May 2012 |
Last updated: 05 November 2013 |
85 |
<br> |
<br> |
86 |
Copyright © 1997-2012 University of Cambridge. |
Copyright © 1997-2013 University of Cambridge. |
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<br> |
<br> |
88 |
<p> |
<p> |
89 |
Return to the <a href="index.html">PCRE index page</a>. |
Return to the <a href="index.html">PCRE index page</a>. |