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Edit File: pcre2_substitute.html

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<title>pcre2_substitute specification</title>
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<h1>pcre2_substitute 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;


int pcre2_substitute(const pcre2_code *code, PCRE2_SPTR subject,
 PCRE2_SIZE length, PCRE2_SIZE startoffset,
 uint32_t options, pcre2_match_data *match_data,
 pcre2_match_context *mcontext, PCRE2_SPTR replacement,
 PCRE2_SIZE rlength, PCRE2_UCHAR *outputbuffer,
 PCRE2_SIZE *outlengthptr);

 
DESCRIPTION
 

This function matches a compiled regular expression against a given subject
string, using a matching algorithm that is similar to Perl's. It then makes a
copy of the subject, substituting a replacement string for what was matched.
Its arguments are:
<pre>
 code Points to the compiled pattern
 subject Points to the subject string
 length Length of the subject string
 startoffset Offset in the subject at which to start matching
 options Option bits
 match_data Points to a match data block, or is NULL
 mcontext Points to a match context, or is NULL
 replacement Points to the replacement string
 rlength Length of the replacement string
 outputbuffer Points to the output buffer
 outlengthptr Points to the length of the output buffer
</pre>
A match context is needed only if you want to:
<pre>
 Set up a callout function
 Change the limit for calling the internal function match()
 Change the limit for calling match() recursively
 Set custom memory management when the heap is used for recursion
</pre>
The length, startoffset and rlength values are code
units, not characters, as is the contents of the variable pointed at by
outlengthptr, which is updated to the actual length of the new string.
The options are:
<pre>
 PCRE2_ANCHORED Match only at the first position
 PCRE2_NOTBOL Subject is not the beginning of a line
 PCRE2_NOTEOL Subject is not the end of a line
 PCRE2_NOTEMPTY An empty string is not a valid match
 PCRE2_NOTEMPTY_ATSTART An empty string at the start of the
 subject is not a valid match
 PCRE2_NO_UTF_CHECK Do not check the subject or replacement
 for UTF validity (only relevant if
 PCRE2_UTF was set at compile time)
 PCRE2_SUBSTITUTE_EXTENDED Do extended replacement processing
 PCRE2_SUBSTITUTE_GLOBAL Replace all occurrences in the subject
 PCRE2_SUBSTITUTE_OVERFLOW_LENGTH If overflow, compute needed length
 PCRE2_SUBSTITUTE_UNKNOWN_UNSET Treat unknown group as unset
 PCRE2_SUBSTITUTE_UNSET_EMPTY Simple unset insert = empty string
</pre>
The function returns the number of substitutions, which may be zero if there
were no matches. The result can be greater than one only when
PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a negative error code
is returned.


There is a complete description of the PCRE2 native API 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>.