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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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<html>
<head>
<title>pcre2limits specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcre2limits man page</h1>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>
<p>
This page is part of the PCRE2 HTML documentation. It was generated
automatically from the original man page. If there is any nonsense in it,
please consult the man page, in case the conversion went wrong.
<br>
<br><b>
SIZE AND OTHER LIMITATIONS
</b><br>
<P>
There are some size limitations in PCRE2 but it is hoped that they will never
in practice be relevant.
</P>
<P>
The maximum size of a compiled pattern is approximately 64 thousand code units
for the 8-bit and 16-bit libraries if PCRE2 is compiled with the default
internal linkage size, which is 2 bytes for these libraries. If you want to
process regular expressions that are truly enormous, you can compile PCRE2 with
an internal linkage size of 3 or 4 (when building the 16-bit library, 3 is
rounded up to 4). See the <b>README</b> file in the source distribution and the
<a href="pcre2build.html"><b>pcre2build</b></a>
documentation for details. In these cases the limit is substantially larger.
However, the speed of execution is slower. In the 32-bit library, the internal
linkage size is always 4.
</P>
<P>
The maximum length of a source pattern string is essentially unlimited; it is
the largest number a PCRE2_SIZE variable can hold. However, the program that
calls <b>pcre2_compile()</b> can specify a smaller limit.
</P>
<P>
The maximum length (in code units) of a subject string is one less than the
largest number a PCRE2_SIZE variable can hold. PCRE2_SIZE is an unsigned
integer type, usually defined as size_t. Its maximum value (that is
~(PCRE2_SIZE)0) is reserved as a special indicator for zero-terminated strings
and unset offsets.
</P>
<P>
All values in repeating quantifiers must be less than 65536.
</P>
<P>
The maximum length of a lookbehind assertion is 65535 characters.
</P>
<P>
There is no limit to the number of parenthesized subpatterns, but there can be
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 default
limit can be specified when PCRE2 is built; if not, the default is set to 250.
An application can change this limit by calling pcre2_set_parens_nest_limit()
to set the limit in a compile context.
</P>
<P>
The maximum length of name for a named subpattern is 32 code units, and the
maximum number of named subpatterns is 10000.
</P>
<P>
The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb
is 255 code units for the 8-bit library and 65535 code units for the 16-bit and
32-bit libraries.
</P>
<P>
The maximum length of a string argument to a callout is the largest number a
32-bit unsigned integer can hold.
</P>
<br><b>
AUTHOR
</b><br>
<P>
Philip Hazel
<br>
University Computing Service
<br>
Cambridge, England.
<br>
</P>
<br><b>
REVISION
</b><br>
<P>
Last updated: 30 March 2017
<br>
Copyright &copy; 1997-2017 University of Cambridge.
<br>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>

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