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119 lines
5.1 KiB
119 lines
5.1 KiB
<html>
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<head>
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<title>pcre2_compile specification</title>
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</head>
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
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<h1>pcre2_compile man page</h1>
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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<p>
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This page is part of the PCRE2 HTML documentation. It was generated
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automatically from the original man page. If there is any nonsense in it,
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please consult the man page, in case the conversion went wrong.
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<br>
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<br><b>
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SYNOPSIS
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</b><br>
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<P>
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<b>#include <pcre2.h></b>
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</P>
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<P>
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<b>pcre2_code *pcre2_compile(PCRE2_SPTR <i>pattern</i>, PCRE2_SIZE <i>length</i>,</b>
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<b> uint32_t <i>options</i>, int *<i>errorcode</i>, PCRE2_SIZE *<i>erroroffset,</i></b>
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<b> pcre2_compile_context *<i>ccontext</i>);</b>
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</P>
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<br><b>
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DESCRIPTION
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</b><br>
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<P>
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This function compiles a regular expression pattern into an internal form. Its
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arguments are:
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<pre>
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<i>pattern</i> A string containing expression to be compiled
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<i>length</i> The length of the string or PCRE2_ZERO_TERMINATED
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<i>options</i> Primary option bits
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<i>errorcode</i> Where to put an error code
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<i>erroffset</i> Where to put an error offset
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<i>ccontext</i> Pointer to a compile context or NULL
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</pre>
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The length of the pattern and any error offset that is returned are in code
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units, not characters. A NULL pattern with zero length is treated as an empty
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string. A compile context is needed only if you want to provide custom memory
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allocation functions, or to provide an external function for system stack size
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checking (see <b>pcre2_set_compile_recursion_guard()</b>), or to change one or
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more of these parameters:
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<pre>
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What \R matches (Unicode newlines, or CR, LF, CRLF only);
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PCRE2's character tables;
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The newline character sequence;
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The compile time nested parentheses limit;
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The maximum pattern length (in code units) that is allowed;
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The additional options bits.
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</pre>
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The primary option bits are:
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<pre>
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PCRE2_ANCHORED Force pattern anchoring
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PCRE2_ALLOW_EMPTY_CLASS Allow empty classes
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PCRE2_ALT_BSUX Alternative handling of \u, \U, and \x
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PCRE2_ALT_CIRCUMFLEX Alternative handling of ^ in multiline mode
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PCRE2_ALT_VERBNAMES Process backslashes in verb names
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PCRE2_AUTO_CALLOUT Compile automatic callouts
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PCRE2_CASELESS Do caseless matching
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PCRE2_DOLLAR_ENDONLY $ not to match newline at end
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PCRE2_DOTALL . matches anything including NL
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PCRE2_DUPNAMES Allow duplicate names for subpatterns
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PCRE2_ENDANCHORED Pattern can match only at end of subject
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PCRE2_EXTENDED Ignore white space and # comments
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PCRE2_FIRSTLINE Force matching to be before newline
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PCRE2_LITERAL Pattern characters are all literal
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PCRE2_MATCH_INVALID_UTF Enable support for matching invalid UTF
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PCRE2_MATCH_UNSET_BACKREF Match unset backreferences
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PCRE2_MULTILINE ^ and $ match newlines within data
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PCRE2_NEVER_BACKSLASH_C Lock out the use of \C in patterns
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PCRE2_NEVER_UCP Lock out PCRE2_UCP, e.g. via (*UCP)
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PCRE2_NEVER_UTF Lock out PCRE2_UTF, e.g. via (*UTF)
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PCRE2_NO_AUTO_CAPTURE Disable numbered capturing paren-
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theses (named ones available)
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PCRE2_NO_AUTO_POSSESS Disable auto-possessification
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PCRE2_NO_DOTSTAR_ANCHOR Disable automatic anchoring for .*
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PCRE2_NO_START_OPTIMIZE Disable match-time start optimizations
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PCRE2_NO_UTF_CHECK Do not check the pattern for UTF validity
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(only relevant if PCRE2_UTF is set)
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PCRE2_UCP Use Unicode properties for \d, \w, etc.
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PCRE2_UNGREEDY Invert greediness of quantifiers
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PCRE2_USE_OFFSET_LIMIT Enable offset limit for unanchored matching
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PCRE2_UTF Treat pattern and subjects as UTF strings
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</pre>
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PCRE2 must be built with Unicode support (the default) in order to use
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PCRE2_UTF, PCRE2_UCP and related options.
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</P>
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<P>
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Additional options may be set in the compile context via the
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<a href="pcre2_set_compile_extra_options.html"><b>pcre2_set_compile_extra_options</b></a>
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function.
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</P>
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<P>
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If either of <i>errorcode</i> or <i>erroroffset</i> is NULL, the function returns
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NULL immediately. Otherwise, the yield of this function is a pointer to a
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private data structure that contains the compiled pattern, or NULL if an error
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was detected. In the error case, a text error message can be obtained by
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passing the value returned via the <i>errorcode</i> argument to the
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<b>pcre2_get_error_message()</b> function. The offset (in code units) where the
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error was encountered is returned via the <i>erroroffset</i> argument.
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</P>
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<P>
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If there is no error, the value passed via <i>errorcode</i> returns the message
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"no error" if passed to <b>pcre2_get_error_message()</b>, and the value passed
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via <i>erroroffset</i> is zero.
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</P>
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<P>
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There is a complete description of the PCRE2 native API, with more detail on
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each option, in the
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<a href="pcre2api.html"><b>pcre2api</b></a>
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page, and a description of the POSIX API in the
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<a href="pcre2posix.html"><b>pcre2posix</b></a>
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page.
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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