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。 .
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<title>pcre2_pattern_info specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcre2_pattern_info 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>
SYNOPSIS
</b><br>
<P>
<b>#include &#60;pcre2.h&#62;</b>
</P>
<P>
<b>int pcre2_pattern_info(const pcre2 *<i>code</i>, uint32_t <i>what</i>, void *<i>where</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function returns information about a compiled pattern. Its arguments are:
<pre>
  <i>code</i>     Pointer to a compiled regular expression pattern
  <i>what</i>     What information is required
  <i>where</i>    Where to put the information
</pre>
The recognized values for the <i>what</i> argument, and the information they
request are as follows:
<pre>
  PCRE2_INFO_ALLOPTIONS      Final options after compiling
  PCRE2_INFO_ARGOPTIONS      Options passed to <b>pcre2_compile()</b>
  PCRE2_INFO_BACKREFMAX      Number of highest backreference
  PCRE2_INFO_BSR             What \R matches:
                               PCRE2_BSR_UNICODE: Unicode line endings
                               PCRE2_BSR_ANYCRLF: CR, LF, or CRLF only
  PCRE2_INFO_CAPTURECOUNT    Number of capturing subpatterns
  PCRE2_INFO_DEPTHLIMIT      Backtracking depth limit if set, otherwise PCRE2_ERROR_UNSET
  PCRE2_INFO_EXTRAOPTIONS    Extra options that were passed in the
                               compile context
  PCRE2_INFO_FIRSTBITMAP     Bitmap of first code units, or NULL
  PCRE2_INFO_FIRSTCODETYPE   Type of start-of-match information
                               0 nothing set
                               1 first code unit is set
                               2 start of string or after newline
  PCRE2_INFO_FIRSTCODEUNIT   First code unit when type is 1
  PCRE2_INFO_FRAMESIZE       Size of backtracking frame
  PCRE2_INFO_HASBACKSLASHC   Return 1 if pattern contains \C
  PCRE2_INFO_HASCRORLF       Return 1 if explicit CR or LF matches exist in the pattern
  PCRE2_INFO_HEAPLIMIT       Heap memory limit if set, otherwise PCRE2_ERROR_UNSET
  PCRE2_INFO_JCHANGED        Return 1 if (?J) or (?-J) was used
  PCRE2_INFO_JITSIZE         Size of JIT compiled code, or 0
  PCRE2_INFO_LASTCODETYPE    Type of must-be-present information
                               0 nothing set
                               1 code unit is set
  PCRE2_INFO_LASTCODEUNIT    Last code unit when type is 1
  PCRE2_INFO_MATCHEMPTY      1 if the pattern can match an empty string, 0 otherwise
  PCRE2_INFO_MATCHLIMIT      Match limit if set, otherwise PCRE2_ERROR_UNSET
  PCRE2_INFO_MAXLOOKBEHIND   Length (in characters) of the longest lookbehind assertion
  PCRE2_INFO_MINLENGTH       Lower bound length of matching strings
  PCRE2_INFO_NAMECOUNT       Number of named subpatterns
  PCRE2_INFO_NAMEENTRYSIZE   Size of name table entries
  PCRE2_INFO_NAMETABLE       Pointer to name table
  PCRE2_CONFIG_NEWLINE       Code for the newline sequence:
                               PCRE2_NEWLINE_CR
                               PCRE2_NEWLINE_LF
                               PCRE2_NEWLINE_CRLF
                               PCRE2_NEWLINE_ANY
                               PCRE2_NEWLINE_ANYCRLF
                               PCRE2_NEWLINE_NUL
  PCRE2_INFO_RECURSIONLIMIT  Obsolete synonym for PCRE2_INFO_DEPTHLIMIT
  PCRE2_INFO_SIZE            Size of compiled pattern
</pre>
If <i>where</i> is NULL, the function returns the amount of memory needed for
the requested information, in bytes. Otherwise, the <i>where</i> argument must
point to an unsigned 32-bit integer (uint32_t variable), except for the
following <i>what</i> values, when it must point to a variable of the type
shown:
<pre>
  PCRE2_INFO_FIRSTBITMAP     const uint8_t *
  PCRE2_INFO_JITSIZE         size_t
  PCRE2_INFO_NAMETABLE       PCRE2_SPTR
  PCRE2_INFO_SIZE            size_t
</pre>
The yield of the function is zero on success or:
<pre>
  PCRE2_ERROR_NULL           the argument <i>code</i> is NULL
  PCRE2_ERROR_BADMAGIC       the "magic number" was not found
  PCRE2_ERROR_BADOPTION      the value of <i>what</i> is invalid
  PCRE2_ERROR_BADMODE        the pattern was compiled in the wrong mode
  PCRE2_ERROR_UNSET          the requested information is not set
</PRE>
</P>
<P>
There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html"><b>pcre2api</b></a>
page and a description of the POSIX API in the
<a href="pcre2posix.html"><b>pcre2posix</b></a>
page.
<p>
Return to the <a href="index.html">PCRE2 index page</a>.
</p>

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