1PCRE2_SUBSTITUTE(3) Library Functions Manual PCRE2_SUBSTITUTE(3)
2
6 PCRE2 - Perl-compatible regular expressions (revised API)
7
9 #include <pcre2.h>
11 int pcre2_substitute(const pcre2_code *code, PCRE2_SPTR subject,
13 PCRE2_SIZE length, PCRE2_SIZE startoffset,
14 uint32_t options, pcre2_match_data *match_data,
15 pcre2_match_context *mcontext, PCRE2_SPTR replacement,
16 PCRE2_SIZE rlength, PCRE2_UCHAR *outputbuffer,
17 PCRE2_SIZE *outlengthptr);
18
20 This function matches a compiled regular expression against a given
22 subject string, using a matching algorithm that is similar to Perl's.
23 It then makes a copy of the subject, substituting a replacement string
24 for what was matched. Its arguments are:
25 code Points to the compiled pattern
27 subject Points to the subject string
28 length Length of the subject string
29 startoffset Offset in the subject at which to start matching
30 options Option bits
31 match_data Points to a match data block, or is NULL
32 mcontext Points to a match context, or is NULL
33 replacement Points to the replacement string
34 rlength Length of the replacement string
35 outputbuffer Points to the output buffer
36 outlengthptr Points to the length of the output buffer
37 A match context is needed only if you want to:
39 Set up a callout function
41 Change the limit for calling the internal function match()
42 Change the limit for calling match() recursively
43 Set custom memory management when the heap is used for recursion
44 The length, startoffset and rlength values are code units, not charac‐
46 ters, as is the contents of the variable pointed at by outlengthptr,
47 which is updated to the actual length of the new string. The options
48 are:
49 PCRE2_ANCHORED Match only at the first position
51 PCRE2_NOTBOL Subject is not the beginning of a line
52 PCRE2_NOTEOL Subject is not the end of a line
53 PCRE2_NOTEMPTY An empty string is not a valid match
54 PCRE2_NOTEMPTY_ATSTART An empty string at the start of the
55 subject is not a valid match
56 PCRE2_NO_UTF_CHECK Do not check the subject or replacement
57 for UTF validity (only relevant if
58 PCRE2_UTF was set at compile time)
59 PCRE2_SUBSTITUTE_EXTENDED Do extended replacement processing
60 PCRE2_SUBSTITUTE_GLOBAL Replace all occurrences in the subject
61 PCRE2_SUBSTITUTE_OVERFLOW_LENGTH If overflow, compute needed length
62 PCRE2_SUBSTITUTE_UNKNOWN_UNSET Treat unknown group as unset
63 PCRE2_SUBSTITUTE_UNSET_EMPTY Simple unset insert = empty string
64 The function returns the number of substitutions, which may be zero if
66 there were no matches. The result can be greater than one only when
67 PCRE2_SUBSTITUTE_GLOBAL is set. In the event of an error, a negative
68 error code is returned.
69 There is a complete description of the PCRE2 native API in the pcre2api
71 page and a description of the POSIX API in the pcre2posix page.
72PCRE2 10.21 12 December 2015 PCRE2_SUBSTITUTE(3)