36af74cb25
Some manual changes done to the library were lost with this update. They will be added in the next commit.
91 lines
3.8 KiB
HTML
91 lines
3.8 KiB
HTML
<html>
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<head>
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<title>pcre2_substitute 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_substitute 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>int pcre2_substitute(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
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<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
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<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
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<b> pcre2_match_context *<i>mcontext</i>, PCRE2_SPTR <i>replacement</i>,</b>
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<b> PCRE2_SIZE <i>rlength</i>, PCRE2_UCHAR *<i>outputbuffer</i>,</b>
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<b> PCRE2_SIZE *<i>outlengthptr</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 matches a compiled regular expression against a given subject
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string, using a matching algorithm that is similar to Perl's. It then makes a
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copy of the subject, substituting a replacement string for what was matched.
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Its arguments are:
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<pre>
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<i>code</i> Points to the compiled pattern
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<i>subject</i> Points to the subject string
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<i>length</i> Length of the subject string
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<i>startoffset</i> Offset in the subject at which to start matching
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<i>options</i> Option bits
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<i>match_data</i> Points to a match data block, or is NULL
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<i>mcontext</i> Points to a match context, or is NULL
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<i>replacement</i> Points to the replacement string
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<i>rlength</i> Length of the replacement string
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<i>outputbuffer</i> Points to the output buffer
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<i>outlengthptr</i> Points to the length of the output buffer
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</pre>
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A match context is needed only if you want to:
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<pre>
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Set up a callout function
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Change the limit for calling the internal function <i>match()</i>
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Change the limit for calling <i>match()</i> recursively
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Set custom memory management when the heap is used for recursion
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</pre>
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The <i>length</i>, <i>startoffset</i> and <i>rlength</i> values are code
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units, not characters, as is the contents of the variable pointed at by
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<i>outlengthptr</i>, which is updated to the actual length of the new string.
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The options are:
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<pre>
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PCRE2_ANCHORED Match only at the first position
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PCRE2_NOTBOL Subject is not the beginning of a line
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PCRE2_NOTEOL Subject is not the end of a line
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PCRE2_NOTEMPTY An empty string is not a valid match
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PCRE2_NOTEMPTY_ATSTART An empty string at the start of the
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subject is not a valid match
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PCRE2_NO_UTF_CHECK Do not check the subject or replacement
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for UTF validity (only relevant if
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PCRE2_UTF was set at compile time)
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PCRE2_SUBSTITUTE_EXTENDED Do extended replacement processing
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PCRE2_SUBSTITUTE_GLOBAL Replace all occurrences in the subject
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PCRE2_SUBSTITUTE_OVERFLOW_LENGTH If overflow, compute needed length
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PCRE2_SUBSTITUTE_UNKNOWN_UNSET Treat unknown group as unset
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PCRE2_SUBSTITUTE_UNSET_EMPTY Simple unset insert = empty string
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</pre>
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The function returns the number of substitutions, which may be zero if there
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were no matches. The result can be greater than one only when
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PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a negative error code
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is returned.
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</P>
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<P>
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There is a complete description of the PCRE2 native API 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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