blob: e69e0ccc04ef890f8e9662a14acd754b8fa85a72 [file] [log] [blame]
.TH PCRE2_SUBSTITUTE 3 "12 December 2015" "PCRE2 10.21"
PCRE2 - Perl-compatible regular expressions (revised API)
.B #include <pcre2.h>
.B int pcre2_substitute(const pcre2_code *\fIcode\fP, PCRE2_SPTR \fIsubject\fP,
.B " PCRE2_SIZE \fIlength\fP, PCRE2_SIZE \fIstartoffset\fP,"
.B " uint32_t \fIoptions\fP, pcre2_match_data *\fImatch_data\fP,"
.B " pcre2_match_context *\fImcontext\fP, PCRE2_SPTR \fIreplacement\fP,"
.B " PCRE2_SIZE \fIrlength\fP, PCRE2_UCHAR *\fIoutputbuffer\fP,"
.B " PCRE2_SIZE *\fIoutlengthptr\fP);"
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:
\fIcode\fP Points to the compiled pattern
\fIsubject\fP Points to the subject string
\fIlength\fP Length of the subject string
\fIstartoffset\fP Offset in the subject at which to start matching
\fIoptions\fP Option bits
\fImatch_data\fP Points to a match data block, or is NULL
\fImcontext\fP Points to a match context, or is NULL
\fIreplacement\fP Points to the replacement string
\fIrlength\fP Length of the replacement string
\fIoutputbuffer\fP Points to the output buffer
\fIoutlengthptr\fP Points to the length of the output buffer
A match context is needed only if you want to:
Set up a callout function
Change the limit for calling the internal function \fImatch()\fP
Change the limit for calling \fImatch()\fP recursively
Set custom memory management when the heap is used for recursion
The \fIlength\fP, \fIstartoffset\fP and \fIrlength\fP values are code
units, not characters, as is the contents of the variable pointed at by
\fIoutlengthptr\fP, which is updated to the actual length of the new string.
The options are:
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
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
.\" HREF
page and a description of the POSIX API in the
.\" HREF