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|
[/
Copyright 2006-2007 John Maddock.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
]
[section:basic_regex basic_regex]
[h4 Synopsis]
#include <boost/regex.hpp>
The template class `basic_regex` encapsulates regular expression
parsing and compilation. The class takes two template parameters:
* `charT`: determines the character type, i.e. either `char` or `wchar_t`;
see [link boost_regex.ref.concepts.charT_concept charT concept].
* `traits`: determines the behavior of the character type, for example which
character class names are recognized. A default traits class is provided:
`regex_traits<charT>`. See also
[link boost_regex.ref.concepts.traits_concept traits concept].
For ease of use there are two typedefs that define the two standard
`basic_regex` instances, unless you want to use custom traits classes or
non-standard character types (for example see
[link boost_regex.ref.non_std_strings.icu unicode support]),
you won't need to use anything other than these:
namespace boost{
template <class charT, class traits = regex_traits<charT> >
class basic_regex;
typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;
}
The definition of `basic_regex` follows: it is based very closely on class
`basic_string`, and fulfils the requirements for a constant-container of `charT`.
namespace boost{
template <class charT, class traits = regex_traits<charT> >
class basic_regex {
public:
// types:
typedef charT value_type;
typedef implementation-specific const_iterator;
typedef const_iterator iterator;
typedef charT& reference;
typedef const charT& const_reference;
typedef std::ptrdiff_t difference_type;
typedef std::size_t size_type;
typedef regex_constants::``[syntax_option_type]`` flag_type;
typedef typename traits::locale_type locale_type;
// constants:
// main option selection:
static const regex_constants::``[syntax_option_type]`` normal
= regex_constants::normal;
static const regex_constants::``[syntax_option_type]`` ECMAScript
= normal;
static const regex_constants::``[syntax_option_type]`` JavaScript
= normal;
static const regex_constants::``[syntax_option_type]`` JScript
= normal;
static const regex_constants::``[syntax_option_type]`` basic
= regex_constants::basic;
static const regex_constants::``[syntax_option_type]`` extended
= regex_constants::extended;
static const regex_constants::``[syntax_option_type]`` awk
= regex_constants::awk;
static const regex_constants::``[syntax_option_type]`` grep
= regex_constants::grep;
static const regex_constants::``[syntax_option_type]`` egrep
= regex_constants::egrep;
static const regex_constants::``[syntax_option_type]`` sed
= basic = regex_constants::sed;
static const regex_constants::``[syntax_option_type]`` perl
= regex_constants::perl;
static const regex_constants::``[syntax_option_type]`` literal
= regex_constants::literal;
// modifiers specific to perl expressions:
static const regex_constants::``[syntax_option_type]`` no_mod_m
= regex_constants::no_mod_m;
static const regex_constants::``[syntax_option_type]`` no_mod_s
= regex_constants::no_mod_s;
static const regex_constants::``[syntax_option_type]`` mod_s
= regex_constants::mod_s;
static const regex_constants::``[syntax_option_type]`` mod_x
= regex_constants::mod_x;
// modifiers specific to POSIX basic expressions:
static const regex_constants::``[syntax_option_type]`` bk_plus_qm
= regex_constants::bk_plus_qm;
static const regex_constants::``[syntax_option_type]`` bk_vbar
= regex_constants::bk_vbar
static const regex_constants::``[syntax_option_type]`` no_char_classes
= regex_constants::no_char_classes
static const regex_constants::``[syntax_option_type]`` no_intervals
= regex_constants::no_intervals
// common modifiers:
static const regex_constants::``[syntax_option_type]`` nosubs
= regex_constants::nosubs;
static const regex_constants::``[syntax_option_type]`` optimize
= regex_constants::optimize;
static const regex_constants::``[syntax_option_type]`` collate
= regex_constants::collate;
static const regex_constants::``[syntax_option_type]`` newline_alt
= regex_constants::newline_alt;
static const regex_constants::``[syntax_option_type]`` no_except
= regex_constants::newline_alt;
// construct/copy/destroy:
explicit ``[link boost_regex.basic_regex.construct1 basic_regex]`` ();
explicit ``[link boost_regex.basic_regex.construct2 basic_regex]``(const charT* p, flag_type f = regex_constants::normal);
``[link boost_regex.basic_regex.construct3 basic_regex]``(const charT* p1, const charT* p2,
flag_type f = regex_constants::normal);
``[link boost_regex.basic_regex.construct4 basic_regex]``(const charT* p, size_type len, flag_type f);
``[link boost_regex.basic_regex.construct5 basic_regex]``(const basic_regex&);
template <class ST, class SA>
explicit ``[link boost_regex.basic_regex.construct6 basic_regex]``(const basic_string<charT, ST, SA>& p,
flag_type f = regex_constants::normal);
template <class InputIterator>
``[link boost_regex.basic_regex.construct7 basic_regex]``(InputIterator first, InputIterator last,
flag_type f = regex_constants::normal);
~basic_regex();
``[link boost_regex.basic_regex.opeq1 basic_regex& operator=]``(const basic_regex&);
``[link boost_regex.basic_regex.opeq2 basic_regex& operator=]`` (const charT* ptr);
template <class ST, class SA>
``[link boost_regex.basic_regex.opeq3 basic_regex& operator=]`` (const basic_string<charT, ST, SA>& p);
// iterators:
``[link boost_regex.basic_regex.subexpression std::pair<const_iterator, const_iterator> subexpression]``(size_type n) const;
``[link boost_regex.basic_regex.begin const_iterator begin]``() const;
``[link boost_regex.basic_regex.end const_iterator end]``() const;
// capacity:
``[link boost_regex.basic_regex.size size_type size]``() const;
``[link boost_regex.basic_regex.max_size size_type max_size]``() const;
``[link boost_regex.basic_regex.empty bool empty]``() const;
``[link boost_regex.basic_regex.mark_count size_type mark_count]``()const;
//
// modifiers:
``[link boost_regex.basic_regex.assign1 basic_regex& assign]``(const basic_regex& that);
``[link boost_regex.basic_regex.assign2 basic_regex& assign]``(const charT* ptr,
flag_type f = regex_constants::normal);
``[link boost_regex.basic_regex.assign3 basic_regex& assign]``(const charT* ptr, unsigned int len, flag_type f);
template <class string_traits, class A>
``[link boost_regex.basic_regex.assign4 basic_regex& assign]``(const basic_string<charT, string_traits, A>& s,
flag_type f = regex_constants::normal);
template <class InputIterator>
``[link boost_regex.basic_regex.assign5 basic_regex& assign]``(InputIterator first, InputIterator last,
flag_type f = regex_constants::normal);
// const operations:
``[link boost_regex.basic_regex.flags flag_type flags]``() const;
``[link boost_regex.basic_regex.status int status]``()const;
``[link boost_regex.basic_regex.str basic_string<charT> str]``() const;
``[link boost_regex.basic_regex.compare int compare]``(basic_regex&) const;
// locale:
``[link boost_regex.basic_regex.imbue locale_type imbue]``(locale_type loc);
``[link boost_regex.basic_regex.getloc locale_type getloc]``() const;
// swap
``[link boost_regex.basic_regex.swap void swap]``(basic_regex&) throw();
};
template <class charT, class traits>
``[link boost_regex.basic_regex.op_eq bool operator ==]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_ne bool operator !=]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_lt bool operator <]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_le bool operator <=]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_ge bool operator >=]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_gt bool operator >]`` (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
template <class charT, class io_traits, class re_traits>
basic_ostream<charT, io_traits>&
``[link boost_regex.basic_regex.op_stream operator <<]`` (basic_ostream<charT, io_traits>& os,
const basic_regex<charT, re_traits>& e);
template <class charT, class traits>
``[link boost_regex.basic_regex.op_swap void swap]``(basic_regex<charT, traits>& e1,
basic_regex<charT, traits>& e2);
typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;
} // namespace boost
[h4 Description]
Class `basic_regex` has the following public members:
// main option selection:
static const regex_constants::``[syntax_option_type]`` normal
= regex_constants::normal;
static const regex_constants::``[syntax_option_type]`` ECMAScript
= normal;
static const regex_constants::``[syntax_option_type]`` JavaScript
= normal;
static const regex_constants::``[syntax_option_type]`` JScript
= normal;
static const regex_constants::``[syntax_option_type]`` basic
= regex_constants::basic;
static const regex_constants::``[syntax_option_type]`` extended
= regex_constants::extended;
static const regex_constants::``[syntax_option_type]`` awk
= regex_constants::awk;
static const regex_constants::``[syntax_option_type]`` grep
= regex_constants::grep;
static const regex_constants::``[syntax_option_type]`` egrep
= regex_constants::egrep;
static const regex_constants::``[syntax_option_type]`` sed
= regex_constants::sed;
static const regex_constants::``[syntax_option_type]`` perl
= regex_constants::perl;
static const regex_constants::``[syntax_option_type]`` literal
= regex_constants::literal;
// modifiers specific to perl expressions:
static const regex_constants::``[syntax_option_type]`` no_mod_m
= regex_constants::no_mod_m;
static const regex_constants::``[syntax_option_type]`` no_mod_s
= regex_constants::no_mod_s;
static const regex_constants::``[syntax_option_type]`` mod_s
= regex_constants::mod_s;
static const regex_constants::``[syntax_option_type]`` mod_x
= regex_constants::mod_x;
// modifiers specific to POSIX basic expressions:
static const regex_constants::``[syntax_option_type]`` bk_plus_qm
= regex_constants::bk_plus_qm;
static const regex_constants::``[syntax_option_type]`` bk_vbar
= regex_constants::bk_vbar
static const regex_constants::``[syntax_option_type]`` no_char_classes
= regex_constants::no_char_classes
static const regex_constants::``[syntax_option_type]`` no_intervals
= regex_constants::no_intervals
// common modifiers:
static const regex_constants::``[syntax_option_type]`` nosubs
= regex_constants::nosubs;
static const regex_constants::``[syntax_option_type]`` optimize
= regex_constants::optimize;
static const regex_constants::``[syntax_option_type]`` collate
= regex_constants::collate;
static const regex_constants::``[syntax_option_type]`` newline_alt
= regex_constants::newline_alt;
The meaning of these options is documented in the [syntax_option_type]
section.
The static constant members are provided as synonyms for the constants declared
in namespace `boost::regex_constants`; for each constant of type [syntax_option_type]
declared in namespace `boost::regex_constants` then a constant with the same name,
type and value is declared within the scope of basic_regex.
[#boost_regex.basic_regex.construct1]
basic_regex();
[*Effects]: Constructs an object of class `basic_regex`.
[table basic_regex default construction postconditions
[[Element][Value]]
[[`empty()`][`true`]]
[[`size()`][`0`]]
[[`str()`][`basic_string<charT>()`]]
]
[#boost_regex.basic_regex.construct2]
basic_regex(const charT* p, flag_type f = regex_constants::normal);
[*Requires]: /p/ shall not be a null pointer.
[*Throws]: [bad_expression] if /p/ is not a valid regular expression,
unless the flag `no_except` is set in /f/.
[*Effects]: Constructs an object of class [basic_regex]; the object's internal
finite state machine is constructed from the regular expression contained
in the null-terminated string /p/, and interpreted according to the
[link boost_regex.ref.syntax_option_type option
flags] specified in /f/.
[table Postconditions for basic_regex construction
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][`char_traits<charT>::length(p)`]]
[[`str()`][`basic_string<charT>(p)`]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.construct3]
basic_regex(const charT* p1, const charT* p2,
flag_type f = regex_constants::normal);
[*Requires]: /p1/ and /p2/ are not null pointers, `p1 < p2`.
[*Throws]: bad_expression if \[p1,p2) is not a valid regular expression, unless
the flag `no_except` is set in /f/.
[*Effects]: Constructs an object of class [basic_regex]; the object's
internal finite state machine is constructed from the regular expression
contained in the sequence of characters \[p1,p2), and interpreted according the
[link boost_regex.ref.syntax_option_type option flags] specified in /f/.
[table Postconditions for basic_regex construction
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][`std::distance(p1,p2)`]]
[[`str()`][`basic_string<charT>(p1,p2)`]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.construct4]
basic_regex(const charT* p, size_type len, flag_type f);
[*Requires]: /p/ shall not be a null pointer, `len < max_size()`.
[*Throws]: [bad_expression] if /p/ is not a valid regular expression, unless
the flag `no_except` is set in /f/.
[*Effects]: Constructs an object of class [basic_regex]; the object's
internal finite state machine is constructed from the regular expression
contained in the sequence of characters \[p, p+len), and interpreted
according the option flags specified in /f/.
[table Postconditions for basic_regex construction
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][['len]]]
[[`str()`][`basic_string<charT>(p, len)`]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.construct5]
basic_regex(const basic_regex& e);
[*Effects]: Constructs an object of class [basic_regex] as a copy of the object
/e/.
[#boost_regex.basic_regex.construct6]
template <class ST, class SA>
basic_regex(const basic_string<charT, ST, SA>& s,
flag_type f = regex_constants::normal);
[*Throws]: [bad_expression] if /s/ is not a valid regular expression,
unless the flag `no_except` is set in /f/.
[*Effects]: Constructs an object of class [basic_regex]; the object's
internal finite state machine is constructed from the regular expression
contained in the string /s/, and interpreted according to the [link boost_regex.ref.syntax_option_type option
flags] specified in /f/.
[table Postconditions for basic_regex construction
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][`s.size()`]]
[[`str()`][['s]]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.construct7]
template <class ForwardIterator>
basic_regex(ForwardIterator first, ForwardIterator last,
flag_type f = regex_constants::normal);
[*Throws]: [bad_expression] if the sequence \[first, last) is not a valid
regular expression, unless the flag `no_except` is set in /f/.
[*Effects]: Constructs an object of class [basic_regex]; the object's
internal finite state machine is constructed from the regular expression
contained in the sequence of characters \[first, last), and interpreted
according to the [link boost_regex.ref.syntax_option_type option flags] specified in /f/.
[table Postconditions for basic_regex construction
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][`distance(first,last)`]]
[[`str()`][`basic_string<charT>(first,last)`]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.opeq1]
basic_regex& operator=(const basic_regex& e);
[*Effects]: Returns the result of `assign(e.str(), e.flags())`.
[#boost_regex.basic_regex.opeq2]
basic_regex& operator=(const charT* ptr);
[*Requires]: /p/ shall not be a null pointer.
[*Effects]: Returns the result of `assign(ptr)`.
[#boost_regex.basic_regex.opeq3]
template <class ST, class SA>
basic_regex& operator=(const basic_string<charT, ST, SA>& p);
[*Effects]: Returns the result of `assign(p)`.
[#boost_regex.basic_regex.subexpression]
std::pair<const_iterator, const_iterator> subexpression(size_type n) const;
[*Effects]: Returns a pair of iterators denoting the location of
marked subexpression /n/ within the original regular expression string.
The returned iterators are relative to `begin()` and `end()`.
[*Requires]: The expression must have been compiled with the
[syntax_option_type] save_subexpression_location set. Argument
/n/ must be in within the range `0 <= n < mark_count()`.
[#boost_regex.basic_regex.begin]
const_iterator begin() const;
[*Effects]: Returns a starting iterator to a sequence of characters representing
the regular expression.
[#boost_regex.basic_regex.end]
const_iterator end() const;
[*Effects]: Returns termination iterator to a sequence of characters representing
the regular expression.
[#boost_regex.basic_regex.size]
size_type size() const;
[*Effects]: Returns the length of the sequence of characters representing the regular expression.
[#boost_regex.basic_regex.max_size]
size_type max_size() const;
[*Effects]: Returns the maximum length of the sequence of characters representing
the regular expression.
[#boost_regex.basic_regex.empty]
bool empty() const;
[*Effects]: Returns true if the object does not contain a valid regular expression,
otherwise false.
[#boost_regex.basic_regex.mark_count]
size_type mark_count() const;
[*Effects]: Returns the number of marked sub-expressions within the regular expression.
[#boost_regex.basic_regex.assign1]
basic_regex& assign(const basic_regex& that);
[*Effects]: Returns [link boost_regex.basic_regex.assign4 `assign(that.str(), that.flags())`].
[#boost_regex.basic_regex.assign2]
basic_regex& assign(const charT* ptr, flag_type f = regex_constants::normal);
[*Effects]: Returns [link boost_regex.basic_regex.assign4 `assign(string_type(ptr), f)`].
[#boost_regex.basic_regex.assign3]
basic_regex& assign(const charT* ptr, unsigned int len, flag_type f);
[*Effects]: Returns [link boost_regex.basic_regex.assign4 `assign(string_type(ptr, len), f)`].
[#boost_regex.basic_regex.assign4]
template <class string_traits, class A>
basic_regex& assign(const basic_string<charT, string_traits, A>& s,
flag_type f = regex_constants::normal);
[*Throws]: [bad_expression] if /s/ is not a valid regular expression,
unless the flag `no_except` is set in /f/.
[*Returns]: *this.
[*Effects]: Assigns the regular expression contained in the string /s/,
interpreted according the [link boost_regex.ref.syntax_option_type option flags]
specified in /f/.
[table Postconditions for basic_regex::assign
[[Element][Value]]
[[`empty()`][`false`]]
[[`size()`][`s.size()`]]
[[`str()`][['s]]]
[[`flags()`][['f]]]
[[`mark_count()`][The number of marked sub-expressions within the expression.]]
]
[#boost_regex.basic_regex.assign5]
template <class InputIterator>
basic_regex& assign(InputIterator first, InputIterator last,
flag_type f = regex_constants::normal);
[*Requires]: The type `InputIterator` corresponds to the
[@http://input_iterator Input Iterator requirements
(24.1.1)].
[*Effects]: Returns [link boost_regex.basic_regex.assign4 `assign(string_type(first, last), f)`].
[#boost_regex.basic_regex.flags]
flag_type flags() const;
[*Effects]: Returns a copy of the [link boost_regex.ref.syntax_option_type
regular expression syntax flags] that were passed to the object's constructor,
or the last call to `assign`.
[#boost_regex.basic_regex.status]
int status() const;
[*Effects]: Returns zero if the expression contains a valid regular expression,
otherwise an error code. This member function is retained for use in
environments that cannot use exception handling.
[#boost_regex.basic_regex.str]
basic_string<charT> str() const;
[*Effects]: Returns a copy of the character sequence passed to the object's constructor,
or the last call to assign.
[#boost_regex.basic_regex.compare]
int compare(basic_regex& e)const;
[*Effects]: If `flags() == e.flags()` then returns `str().compare(e.str())`,
otherwise returns `flags() - e.flags()`.
[#boost_regex.basic_regex.imbue]
locale_type imbue(locale_type l);
[*Effects]: Returns the result of `traits_inst.imbue(l)` where `traits_inst` is
a (default initialized) instance of the template parameter `traits` stored
within the object. Calls to `imbue` invalidate any currently contained
regular expression.
[*Postcondition]: `empty() == true`.
[#boost_regex.basic_regex.getloc]
locale_type getloc() const;
[*Effects]: Returns the result of `traits_inst.getloc()` where `traits_inst` is
a (default initialized) instance of the template parameter traits stored
within the object.
[#boost_regex.basic_regex.swap]
void swap(basic_regex& e) throw();
[*Effects]: Swaps the contents of the two regular expressions.
[*Postcondition]: `*this` contains the regular expression that was in /e/, /e/ contains
the regular expression that was in `*this`.
[*Complexity]: constant time.
[note Comparisons between [basic_regex] objects are provided on an
experimental basis: please note that these are not present in the [tr1],
so use with care if you are writing code that may need to be ported
to other implementations of [basic_regex].]
[#boost_regex.basic_regex.op_eq]
template <class charT, class traits>
bool operator == (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) == 0`.
[#boost_regex.basic_regex.op_ne]
template <class charT, class traits>
bool operator != (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) != 0`.
[#boost_regex.basic_regex.op_lt]
template <class charT, class traits>
bool operator < (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) < 0`.
[#boost_regex.basic_regex.op_le]
template <class charT, class traits>
bool operator <= (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) <= 0`.
[#boost_regex.basic_regex.op_ge]
template <class charT, class traits>
bool operator >= (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) >= 0`.
[#boost_regex.basic_regex.op_gt]
template <class charT, class traits>
bool operator > (const basic_regex<charT, traits>& lhs,
const basic_regex<charT, traits>& rhs);
[*Effects]: Returns `lhs.compare(rhs) > 0`.
[note The basic_regex stream inserter is provided on an experimental basis,
and outputs the textual representation of the expression to the stream.]
[#boost_regex.basic_regex.op_stream]
template <class charT, class io_traits, class re_traits>
basic_ostream<charT, io_traits>&
operator << (basic_ostream<charT, io_traits>& os
const basic_regex<charT, re_traits>& e);
[*Effects]: Returns `(os << e.str())`.
[#boost_regex.basic_regex.op_swap]
template <class charT, class traits>
void swap(basic_regex<charT, traits>& lhs,
basic_regex<charT, traits>& rhs);
[*Effects]: calls `lhs.swap(rhs)`.
[endsect]
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