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<title>pcre2_compile specification</title>
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<h1>pcre2_compile man page</h1>

Return to the <a href="index.html">PCRE2 index page</a>.


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.
 
 
SYNOPSIS
 

#include &#60;pcre2.h&#62;


pcre2_code *pcre2_compile(PCRE2_SPTR pattern, PCRE2_SIZE length,
 uint32_t options, int *errorcode, PCRE2_SIZE *erroroffset,
 pcre2_compile_context *ccontext);

 
DESCRIPTION
 

This function compiles a regular expression pattern into an internal form. Its
arguments are:
<pre>
 pattern A string containing expression to be compiled
 length The length of the string or PCRE2_ZERO_TERMINATED
 options Option bits
 errorcode Where to put an error code
 erroffset Where to put an error offset
 ccontext Pointer to a compile context or NULL
</pre>
The length of the pattern and any error offset that is returned are in code
units, not characters. A compile context is needed only if you want to provide
custom memory allocation functions, or to provide an external function for
system stack size checking, or to change one or more of these parameters:
<pre>
 What \R matches (Unicode newlines, or CR, LF, CRLF only);
 PCRE2's character tables;
 The newline character sequence;
 The compile time nested parentheses limit;
 The maximum pattern length (in code units) that is allowed.
 The additional options bits (see pcre2_set_compile_extra_options())
</pre>
The option bits are:
<pre>
 PCRE2_ANCHORED Force pattern anchoring
 PCRE2_ALLOW_EMPTY_CLASS Allow empty classes
 PCRE2_ALT_BSUX Alternative handling of \u, \U, and \x
 PCRE2_ALT_CIRCUMFLEX Alternative handling of ^ in multiline mode
 PCRE2_ALT_VERBNAMES Process backslashes in verb names
 PCRE2_AUTO_CALLOUT Compile automatic callouts
 PCRE2_CASELESS Do caseless matching
 PCRE2_DOLLAR_ENDONLY $ not to match newline at end
 PCRE2_DOTALL . matches anything including NL
 PCRE2_DUPNAMES Allow duplicate names for subpatterns
 PCRE2_ENDANCHORED Pattern can match only at end of subject
 PCRE2_EXTENDED Ignore white space and # comments
 PCRE2_FIRSTLINE Force matching to be before newline
 PCRE2_LITERAL Pattern characters are all literal
 PCRE2_MATCH_INVALID_UTF Enable support for matching invalid UTF
 PCRE2_MATCH_UNSET_BACKREF Match unset backreferences
 PCRE2_MULTILINE ^ and $ match newlines within data
 PCRE2_NEVER_BACKSLASH_C Lock out the use of \C in patterns
 PCRE2_NEVER_UCP Lock out PCRE2_UCP, e.g. via (*UCP)
 PCRE2_NEVER_UTF Lock out PCRE2_UTF, e.g. via (*UTF)
 PCRE2_NO_AUTO_CAPTURE Disable numbered capturing paren-
 theses (named ones available)
 PCRE2_NO_AUTO_POSSESS Disable auto-possessification
 PCRE2_NO_DOTSTAR_ANCHOR Disable automatic anchoring for .*
 PCRE2_NO_START_OPTIMIZE Disable match-time start optimizations
 PCRE2_NO_UTF_CHECK Do not check the pattern for UTF validity
 (only relevant if PCRE2_UTF is set)
 PCRE2_UCP Use Unicode properties for \d, \w, etc.
 PCRE2_UNGREEDY Invert greediness of quantifiers
 PCRE2_USE_OFFSET_LIMIT Enable offset limit for unanchored matching
 PCRE2_UTF Treat pattern and subjects as UTF strings
</pre>
PCRE2 must be built with Unicode support (the default) in order to use
PCRE2_UTF, PCRE2_UCP and related options.


Additional options may be set in the compile context via the
<a href="pcre2_set_compile_extra_options.html">pcre2_set_compile_extra_options</a>
function.


The yield of this function is a pointer to a private data structure that
contains the compiled pattern, or NULL if an error was detected.


There is a complete description of the PCRE2 native API, with more detail on
each option, in the
<a href="pcre2api.html">pcre2api</a>
page, and a description of the POSIX API in the
<a href="pcre2posix.html">pcre2posix</a>
page.

Return to the <a href="index.html">PCRE2 index page</a>.

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