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Path: ~//proc/thread-self/root/proc/thread-self/root/proc/thread-self/root/opt/alt/pcre/usr/share/man/man3/

File Content: `pcrecpp.3`

.TH PCRECPP 3 "08 January 2012" "PCRE 8.30"
.SH NAME
PCRE - Perl-compatible regular expressions.
.SH "SYNOPSIS OF C++ WRAPPER"
.rs
.sp
.B #include <pcrecpp.h>
.
.SH DESCRIPTION
.rs
.sp
The C++ wrapper for PCRE was provided by Google Inc. Some additional
functionality was added by Giuseppe Maxia. This brief man page was constructed
from the notes in the \fIpcrecpp.h\fP file, which should be consulted for
further details. Note that the C++ wrapper supports only the original 8-bit
PCRE library. There is no 16-bit or 32-bit support at present.
.
.
.SH "MATCHING INTERFACE"
.rs
.sp
The "FullMatch" operation checks that supplied text matches a supplied pattern
exactly. If pointer arguments are supplied, it copies matched sub-strings that
match sub-patterns into them.
.sp
  Example: successful match
     pcrecpp::RE re("h.*o");
     re.FullMatch("hello");
.sp
  Example: unsuccessful match (requires full match):
     pcrecpp::RE re("e");
     !re.FullMatch("hello");
.sp
  Example: creating a temporary RE object:
     pcrecpp::RE("h.*o").FullMatch("hello");
.sp
You can pass in a "const char*" or a "string" for "text". The examples below
tend to use a const char*. You can, as in the different examples above, store
the RE object explicitly in a variable or use a temporary RE object. The
examples below use one mode or the other arbitrarily. Either could correctly be
used for any of these examples.
.P
You must supply extra pointer arguments to extract matched subpieces.
.sp
  Example: extracts "ruby" into "s" and 1234 into "i"
     int i;
     string s;
     pcrecpp::RE re("(\e\ew+):(\e\ed+)");
     re.FullMatch("ruby:1234", &s, &i);
.sp
  Example: does not try to extract any extra sub-patterns
     re.FullMatch("ruby:1234", &s);
.sp
  Example: does not try to extract into NULL
     re.FullMatch("ruby:1234", NULL, &i);
.sp
  Example: integer overflow causes failure
     !re.FullMatch("ruby:1234567891234", NULL, &i);
.sp
  Example: fails because there aren't enough sub-patterns:
     !pcrecpp::RE("\e\ew+:\e\ed+").FullMatch("ruby:1234", &s);
.sp
  Example: fails because string cannot be stored in integer
     !pcrecpp::RE("(.*)").FullMatch("ruby", &i);
.sp
The provided pointer arguments can be pointers to any scalar numeric
type, or one of:
.sp
   string        (matched piece is copied to string)
   StringPiece   (StringPiece is mutated to point to matched piece)
   T             (where "bool T::ParseFrom(const char*, int)" exists)
   NULL          (the corresponding matched sub-pattern is not copied)
.sp
The function returns true iff all of the following conditions are satisfied:
.sp
  a. "text" matches "pattern" exactly;
.sp
  b. The number of matched sub-patterns is >= number of supplied
     pointers;
.sp
  c. The "i"th argument has a suitable type for holding the
     string captured as the "i"th sub-pattern. If you pass in
     void * NULL for the "i"th argument, or a non-void * NULL
     of the correct type, or pass fewer arguments than the
     number of sub-patterns, "i"th captured sub-pattern is
     ignored.
.sp
CAVEAT: An optional sub-pattern that does not exist in the matched
string is assigned the empty string. Therefore, the following will
return false (because the empty string is not a valid number):
.sp
   int number;
   pcrecpp::RE::FullMatch("abc", "[a-z]+(\e\ed+)?", &number);
.sp
The matching interface supports at most 16 arguments per call.
If you need more, consider using the more general interface
\fBpcrecpp::RE::DoMatch\fP. See \fBpcrecpp.h\fP for the signature for
\fBDoMatch\fP.
.P
NOTE: Do not use \fBno_arg\fP, which is used internally to mark the end of a
list of optional arguments, as a placeholder for missing arguments, as this can
lead to segfaults.
.
.
.SH "QUOTING METACHARACTERS"
.rs
.sp
You can use the "QuoteMeta" operation to insert backslashes before all
potentially meaningful characters in a string. The returned string, used as a
regular expression, will exactly match the original string.
.sp
  Example:
     string quoted = RE::QuoteMeta(unquoted);
.sp
Note that it's legal to escape a character even if it has no special meaning in
a regular expression -- so this function does that. (This also makes it
identical to the perl function of the same name; see "perldoc -f quotemeta".)
For example, "1.5-2.0?" becomes "1\e.5\e-2\e.0\e?".
.
.SH "PARTIAL MATCHES"
.rs
.sp
You can use the "PartialMatch" operation when you want the pattern
to match any substring of the text.
.sp
  Example: simple search for a string:
     pcrecpp::RE("ell").PartialMatch("hello");
.sp
  Example: find first number in a string:
     int number;
     pcrecpp::RE re("(\e\ed+)");
     re.PartialMatch("x*100 + 20", &number);
     assert(number == 100);
.
.
.SH "UTF-8 AND THE MATCHING INTERFACE"
.rs
.sp
By default, pattern and text are plain text, one byte per character. The UTF8
flag, passed to the constructor, causes both pattern and string to be treated
as UTF-8 text, still a byte stream but potentially multiple bytes per
character. In practice, the text is likelier to be UTF-8 than the pattern, but
the match returned may depend on the UTF8 flag, so always use it when matching
UTF8 text. For example, "." will match one byte normally but with UTF8 set may
match up to three bytes of a multi-byte character.
.sp
  Example:
     pcrecpp::RE_Options options;
     options.set_utf8();
     pcrecpp::RE re(utf8_pattern, options);
     re.FullMatch(utf8_string);
.sp
  Example: using the convenience function UTF8():
     pcrecpp::RE re(utf8_pattern, pcrecpp::UTF8());
     re.FullMatch(utf8_string);
.sp
NOTE: The UTF8 flag is ignored if pcre was not configured with the
      --enable-utf8 flag.
.
.
.SH "PASSING MODIFIERS TO THE REGULAR EXPRESSION ENGINE"
.rs
.sp
PCRE defines some modifiers to change the behavior of the regular expression
engine. The C++ wrapper defines an auxiliary class, RE_Options, as a vehicle to
pass such modifiers to a RE class. Currently, the following modifiers are
supported:
.sp
   modifier              description               Perl corresponding
.sp
   PCRE_CASELESS         case insensitive match      /i
   PCRE_MULTILINE        multiple lines match        /m
   PCRE_DOTALL           dot matches newlines        /s
   PCRE_DOLLAR_ENDONLY   $ matches only at end       N/A
   PCRE_EXTRA            strict escape parsing       N/A
   PCRE_EXTENDED         ignore white spaces         /x
   PCRE_UTF8             handles UTF8 chars          built-in
   PCRE_UNGREEDY         reverses * and *?           N/A
   PCRE_NO_AUTO_CAPTURE  disables capturing parens   N/A (*)
.sp
(*) Both Perl and PCRE allow non capturing parentheses by means of the
"?:" modifier within the pattern itself. e.g. (?:ab|cd) does not
capture, while (ab|cd) does.
.P
For a full account on how each modifier works, please check the
PCRE API reference page.
.P
For each modifier, there are two member functions whose name is made
out of the modifier in lowercase, without the "PCRE_" prefix. For
instance, PCRE_CASELESS is handled by
.sp
  bool caseless()
.sp
which returns true if the modifier is set, and
.sp
  RE_Options & set_caseless(bool)
.sp
which sets or unsets the modifier. Moreover, PCRE_EXTRA_MATCH_LIMIT can be
accessed through the \fBset_match_limit()\fP and \fBmatch_limit()\fP member
functions. Setting \fImatch_limit\fP to a non-zero value will limit the
execution of pcre to keep it from doing bad things like blowing the stack or
taking an eternity to return a result. A value of 5000 is good enough to stop
stack blowup in a 2MB thread stack. Setting \fImatch_limit\fP to zero disables
match limiting. Alternatively, you can call \fBmatch_limit_recursion()\fP
which uses PCRE_EXTRA_MATCH_LIMIT_RECURSION to limit how much PCRE
recurses. \fBmatch_limit()\fP limits the number of matches PCRE does;
\fBmatch_limit_recursion()\fP limits the depth of internal recursion, and
therefore the amount of stack that is used.
.P
Normally, to pass one or more modifiers to a RE class, you declare
a \fIRE_Options\fP object, set the appropriate options, and pass this
object to a RE constructor. Example:
.sp
   RE_Options opt;
   opt.set_caseless(true);
   if (RE("HELLO", opt).PartialMatch("hello world")) ...
.sp
RE_options has two constructors. The default constructor takes no arguments and
creates a set of flags that are off by default. The optional parameter
\fIoption_flags\fP is to facilitate transfer of legacy code from C programs.
This lets you do
.sp
   RE(pattern,
     RE_Options(PCRE_CASELESS|PCRE_MULTILINE)).PartialMatch(str);
.sp
However, new code is better off doing
.sp
   RE(pattern,
     RE_Options().set_caseless(true).set_multiline(true))
       .PartialMatch(str);
.sp
If you are going to pass one of the most used modifiers, there are some
convenience functions that return a RE_Options class with the
appropriate modifier already set: \fBCASELESS()\fP, \fBUTF8()\fP,
\fBMULTILINE()\fP, \fBDOTALL\fP(), and \fBEXTENDED()\fP.
.P
If you need to set several options at once, and you don't want to go through
the pains of declaring a RE_Options object and setting several options, there
is a parallel method that give you such ability on the fly. You can concatenate
several \fBset_xxxxx()\fP member functions, since each of them returns a
reference to its class object. For example, to pass PCRE_CASELESS,
PCRE_EXTENDED, and PCRE_MULTILINE to a RE with one statement, you may write:
.sp
   RE(" ^ xyz \e\es+ .* blah$",
     RE_Options()
       .set_caseless(true)
       .set_extended(true)
       .set_multiline(true)).PartialMatch(sometext);
.sp
.
.
.SH "SCANNING TEXT INCREMENTALLY"
.rs
.sp
The "Consume" operation may be useful if you want to repeatedly
match regular expressions at the front of a string and skip over
them as they match. This requires use of the "StringPiece" type,
which represents a sub-range of a real string. Like RE, StringPiece
is defined in the pcrecpp namespace.
.sp
  Example: read lines of the form "var = value" from a string.
     string contents = ...;                 // Fill string somehow
     pcrecpp::StringPiece input(contents);  // Wrap in a StringPiece
.sp
     string var;
     int value;
     pcrecpp::RE re("(\e\ew+) = (\e\ed+)\en");
     while (re.Consume(&input, &var, &value)) {
       ...;
     }
.sp
Each successful call to "Consume" will set "var/value", and also
advance "input" so it points past the matched text.
.P
The "FindAndConsume" operation is similar to "Consume" but does not
anchor your match at the beginning of the string. For example, you
could extract all words from a string by repeatedly calling
.sp
  pcrecpp::RE("(\e\ew+)").FindAndConsume(&input, &word)
.
.
.SH "PARSING HEX/OCTAL/C-RADIX NUMBERS"
.rs
.sp
By default, if you pass a pointer to a numeric value, the
corresponding text is interpreted as a base-10 number. You can
instead wrap the pointer with a call to one of the operators Hex(),
Octal(), or CRadix() to interpret the text in another base. The
CRadix operator interprets C-style "0" (base-8) and "0x" (base-16)
prefixes, but defaults to base-10.
.sp
  Example:
    int a, b, c, d;
    pcrecpp::RE re("(.*) (.*) (.*) (.*)");
    re.FullMatch("100 40 0100 0x40",
                 pcrecpp::Octal(&a), pcrecpp::Hex(&b),
                 pcrecpp::CRadix(&c), pcrecpp::CRadix(&d));
.sp
will leave 64 in a, b, c, and d.
.
.
.SH "REPLACING PARTS OF STRINGS"
.rs
.sp
You can replace the first match of "pattern" in "str" with "rewrite".
Within "rewrite", backslash-escaped digits (\e1 to \e9) can be
used to insert text matching corresponding parenthesized group
from the pattern. \e0 in "rewrite" refers to the entire matching
text. For example:
.sp
  string s = "yabba dabba doo";
  pcrecpp::RE("b+").Replace("d", &s);
.sp
will leave "s" containing "yada dabba doo". The result is true if the pattern
matches and a replacement occurs, false otherwise.
.P
\fBGlobalReplace\fP is like \fBReplace\fP except that it replaces all
occurrences of the pattern in the string with the rewrite. Replacements are
not subject to re-matching. For example:
.sp
  string s = "yabba dabba doo";
  pcrecpp::RE("b+").GlobalReplace("d", &s);
.sp
will leave "s" containing "yada dada doo". It returns the number of
replacements made.
.P
\fBExtract\fP is like \fBReplace\fP, except that if the pattern matches,
"rewrite" is copied into "out" (an additional argument) with substitutions.
The non-matching portions of "text" are ignored. Returns true iff a match
occurred and the extraction happened successfully;  if no match occurs, the
string is left unaffected.
.
.
.SH AUTHOR
.rs
.sp
.nf
The C++ wrapper was contributed by Google Inc.
Copyright (c) 2007 Google Inc.
.fi
.
.
.SH REVISION
.rs
.sp
.nf
Last updated: 08 January 2012
.fi

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FILE FOLDER

Name	Size	Permission
pcre.3	9278 bytes	0644
pcre16.3	13298 bytes	0644
pcre16_assign_jit_stack.3	1938 bytes	0644
pcre16_compile.3	4169 bytes	0644
pcre16_compile2.3	4330 bytes	0644
pcre16_config.3	3393 bytes	0644
pcre16_copy_named_substring.3	1773 bytes	0644
pcre16_copy_substring.3	1545 bytes	0644
pcre16_dfa_exec.3	5317 bytes	0644
pcre16_exec.3	4455 bytes	0644
pcre16_free_study.3	702 bytes	0644
pcre16_free_substring.3	749 bytes	0644
pcre16_free_substring_list.3	751 bytes	0644
pcre16_fullinfo.3	4584 bytes	0644
pcre16_get_named_substring.3	1877 bytes	0644
pcre16_get_stringnumber.3	1223 bytes	0644
pcre16_get_stringtable_entries.3	1497 bytes	0644
pcre16_get_substring.3	1676 bytes	0644
pcre16_get_substring_list.3	1635 bytes	0644
pcre16_jit_exec.3	4200 bytes	0644
pcre16_jit_stack_alloc.3	1163 bytes	0644
pcre16_jit_stack_free.3	731 bytes	0644
pcre16_maketables.3	870 bytes	0644
pcre16_pattern_to_host_byte_order.3	1397 bytes	0644
pcre16_refcount.3	906 bytes	0644
pcre16_study.3	1575 bytes	0644
pcre16_utf16_to_host_byte_order.3	1494 bytes	0644
pcre16_version.3	650 bytes	0644
pcre32.3	13184 bytes	0644
pcre32_assign_jit_stack.3	1938 bytes	0644
pcre32_compile.3	4169 bytes	0644
pcre32_compile2.3	4330 bytes	0644
pcre32_config.3	3393 bytes	0644
pcre32_copy_named_substring.3	1773 bytes	0644
pcre32_copy_substring.3	1545 bytes	0644
pcre32_dfa_exec.3	5317 bytes	0644
pcre32_exec.3	4455 bytes	0644
pcre32_free_study.3	702 bytes	0644
pcre32_free_substring.3	749 bytes	0644
pcre32_free_substring_list.3	751 bytes	0644
pcre32_fullinfo.3	4584 bytes	0644
pcre32_get_named_substring.3	1877 bytes	0644
pcre32_get_stringnumber.3	1223 bytes	0644
pcre32_get_stringtable_entries.3	1497 bytes	0644
pcre32_get_substring.3	1676 bytes	0644
pcre32_get_substring_list.3	1635 bytes	0644
pcre32_jit_exec.3	4200 bytes	0644
pcre32_jit_stack_alloc.3	1163 bytes	0644
pcre32_jit_stack_free.3	731 bytes	0644
pcre32_maketables.3	870 bytes	0644
pcre32_pattern_to_host_byte_order.3	1397 bytes	0644
pcre32_refcount.3	906 bytes	0644
pcre32_study.3	1575 bytes	0644
pcre32_utf32_to_host_byte_order.3	1491 bytes	0644
pcre32_version.3	650 bytes	0644
pcre_assign_jit_stack.3	1938 bytes	0644
pcre_compile.3	4169 bytes	0644
pcre_compile2.3	4330 bytes	0644
pcre_config.3	3393 bytes	0644
pcre_copy_named_substring.3	1773 bytes	0644
pcre_copy_substring.3	1545 bytes	0644
pcre_dfa_exec.3	5317 bytes	0644
pcre_exec.3	4455 bytes	0644
pcre_free_study.3	702 bytes	0644
pcre_free_substring.3	749 bytes	0644
pcre_free_substring_list.3	751 bytes	0644
pcre_fullinfo.3	4584 bytes	0644
pcre_get_named_substring.3	1877 bytes	0644
pcre_get_stringnumber.3	1223 bytes	0644
pcre_get_stringtable_entries.3	1497 bytes	0644
pcre_get_substring.3	1676 bytes	0644
pcre_get_substring_list.3	1635 bytes	0644
pcre_jit_exec.3	4200 bytes	0644
pcre_jit_stack_alloc.3	1163 bytes	0644
pcre_jit_stack_free.3	731 bytes	0644
pcre_maketables.3	870 bytes	0644
pcre_pattern_to_host_byte_order.3	1397 bytes	0644
pcre_refcount.3	906 bytes	0644
pcre_study.3	1575 bytes	0644
pcre_utf16_to_host_byte_order.3	1494 bytes	0644
pcre_utf32_to_host_byte_order.3	1491 bytes	0644
pcre_version.3	650 bytes	0644
pcreapi.3	129129 bytes	0644
pcrebuild.3	19745 bytes	0644
pcrecallout.3	10374 bytes	0644
pcrecompat.3	9178 bytes	0644
pcrecpp.3	12709 bytes	0644
pcredemo.3	15682 bytes	0644
pcrejit.3	20124 bytes	0644
pcrelimits.3	2657 bytes	0644
pcrematching.3	9472 bytes	0644
pcrepartial.3	21605 bytes	0644
pcrepattern.3	136538 bytes	0644
pcreperform.3	7275 bytes	0644
pcreposix.3	10693 bytes	0644
pcreprecompile.3	6285 bytes	0644
pcresample.3	3215 bytes	0644
pcrestack.3	8901 bytes	0644
pcresyntax.3	13589 bytes	0644
pcreunicode.3	10746 bytes	0644

File Content: pcrecpp.3

File Content: `pcrecpp.3`