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Like Boost.Regex, Boost.Xpressive provides functions to search strings using regular expressions. However, Boost.Xpressive makes it possible to write down regular expressions as C++ code rather than strings. That makes it possible to check at compile time whether a regular expression is valid or not.

Only Boost.Regex was incorporated into C++11. The standard library doesn't provide any support for writing regular expressions as C++ code.

boost/xpressive/xpressive.hpp provides access to most library functions in Boost.Xpressive. For some functions, additional header files must be included. All definitions of the library can be found in the namespace boost::xpressive.

Boost.Xpressive basically provides the same functions as Boost.Regex, except they are defined in the namespace of Boost.Xpressive. boost::xpressive::regex_match() compares strings, boost::xpressive::regex_search() searches in strings, and boost::xpressive::regex_replace() replaces characters in strings. You can see this in Example 9.1, which uses the function boost::xpressive::regex_match(), and which looks similar to Example 8.1.

However, there is a fundamental difference between Boost.Xpressive and Boost.Regex. The type of the regular expression in Boost.Xpressive depends on the type of the string being searched. Because s is based on std::string in Example 9.1, the type of the regular expression must be boost::xpressive::sregex. Compare this with Example 9.2, where the regular expression is applied to a string of type const char*.

For strings of type const char*, use the class boost::xpressive::cregex. If you use other string types, such as std::wstring or const wchar_t*, use boost::xpressive::wsregex or boost::xpressive::wcregex. Image editor 0 61.

You must call the static member function compile() for regular expressions written as strings. The member function must be called on the type used for the regular expression.

Boost.Xpressive supports direct initialization of regular expressions that are written as C++ code. The regular expression has to be expressed in the notation supported by Boost.Xpressive (see Example 9.3).

The regular expression from Example 9.2, which was written as the string 'w+sw+', is now expressed in Example 9.3 as +_w >> _s >> +_w. It is exactly the same regular expression. Both examples search for at least one alphanumeric character followed by one space followed by at least one alphanumeric character.

Boost.Xpressive makes it possible to write regular expressions with C++ code. The library provides objects for character groups. For example, the object _w is similar to 'w'. _s has the same meaning as 's'.

While 'w' and 's' can be written one after another in a string, objects like _w and _s must be concatenated with an operator. Otherwise, the result wouldn't be valid C++ code. Boost.Xpressive provides the operator operator>>, which is used in Example 9.3.

To express that at least one alphanumeric character should be found, _w is prefixed with a plus sign. While the syntax of regular expressions expects that quantifiers are put behind character groups – like with 'w+' – the plus sign must be put in front of _w. The plus sign is an unary operator, which in C++ must be put in front of an object.

Boost.Xpressive emulates the rules of regular expressions as much as they can be emulated in C++. However, there are limits. For example, the question mark is a meta character in regular expressions to express that a preceding item is optional. Since the question mark isn't a valid operator in C++, Boost.Xpressive replaces it with the exclamation mark. A notation like 'w?' becomes !_w with Boost.Xpressive because the exclamation mark must be prefixed.

Boost.Xpressive supports actions that can be linked to expressions – something Boost.Regex doesn't support.

Example 9.4 returns true for boost::xpressive::regex_match() and writes Boost to standard output.

You can link actions to expressions. An action is executed when the respective expression is found. In Example 9.4, the expression +_w is linked to the action *boost::xpressive::ref(it) = _. The action is a lambda function. The object _ refers to characters found by the expression – in this case the first word in s. The respective characters are assigned to the iterator it. Because it is an iterator of type std::ostream_iterator, which has been initialized with std::cout, Boost is written to standard output.

Please note that you must use the function boost::xpressive::ref() to wrap the iterator it. Only then it is possible to assign _ to the iterator. _ is an object provided by Boost.Xpressive in the namespace boost::xpressive, which normally couldn't be assigned to an iterator of type std::ostream_iterator. Because the assignment happens only when the string 'Boost' has been found with +_w, boost::xpressive::ref() turns the assignment into a lazy operation. Although the code in square brackets attached to +_w is, according to C++ rules, immediately executed, the assignment to the iterator it can only occur when the regular expression is used. Thus, *boost::xpressive::ref(it) = _ isn't executed immediately.

Example 9.4 includes the header file boost/xpressive/regex_actions.hpp. This is required because actions aren't available through boost/xpressive/xpressive.hpp.

Like Boost.Regex, Boost.Xpressive supports iterators to split a string with regular expressions. The classes boost::xpressive::regex_token_iterator and boost::xpressive::regex_iterator do this. It is also possible to link a locale to a regular expression to use a locale other than the global one.

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Xpressive 2 0 0 Download Free Version

While 'w' and 's' can be written one after another in a string, objects like _w and _s must be concatenated with an operator. Otherwise, the result wouldn't be valid C++ code. Boost.Xpressive provides the operator operator>>, which is used in Example 9.3.

To express that at least one alphanumeric character should be found, _w is prefixed with a plus sign. While the syntax of regular expressions expects that quantifiers are put behind character groups – like with 'w+' – the plus sign must be put in front of _w. The plus sign is an unary operator, which in C++ must be put in front of an object.

Boost.Xpressive emulates the rules of regular expressions as much as they can be emulated in C++. However, there are limits. For example, the question mark is a meta character in regular expressions to express that a preceding item is optional. Since the question mark isn't a valid operator in C++, Boost.Xpressive replaces it with the exclamation mark. A notation like 'w?' becomes !_w with Boost.Xpressive because the exclamation mark must be prefixed.

Boost.Xpressive supports actions that can be linked to expressions – something Boost.Regex doesn't support.

Example 9.4 returns true for boost::xpressive::regex_match() and writes Boost to standard output.

You can link actions to expressions. An action is executed when the respective expression is found. In Example 9.4, the expression +_w is linked to the action *boost::xpressive::ref(it) = _. The action is a lambda function. The object _ refers to characters found by the expression – in this case the first word in s. The respective characters are assigned to the iterator it. Because it is an iterator of type std::ostream_iterator, which has been initialized with std::cout, Boost is written to standard output.

Please note that you must use the function boost::xpressive::ref() to wrap the iterator it. Only then it is possible to assign _ to the iterator. _ is an object provided by Boost.Xpressive in the namespace boost::xpressive, which normally couldn't be assigned to an iterator of type std::ostream_iterator. Because the assignment happens only when the string 'Boost' has been found with +_w, boost::xpressive::ref() turns the assignment into a lazy operation. Although the code in square brackets attached to +_w is, according to C++ rules, immediately executed, the assignment to the iterator it can only occur when the regular expression is used. Thus, *boost::xpressive::ref(it) = _ isn't executed immediately.

Example 9.4 includes the header file boost/xpressive/regex_actions.hpp. This is required because actions aren't available through boost/xpressive/xpressive.hpp.

Like Boost.Regex, Boost.Xpressive supports iterators to split a string with regular expressions. The classes boost::xpressive::regex_token_iterator and boost::xpressive::regex_iterator do this. It is also possible to link a locale to a regular expression to use a locale other than the global one.

• Download

Often downloaded with

• xPressThe software is designed for printing houses, photocopy offices and other..DOWNLOAD
• Xpress VIPXpress VIP is a flash utility that can be used to verify and save firmware..DOWNLOAD
• Xpress TunerThe Xpress-Optimizer features sophisticated, robust multi-threaded algorithms..DOWNLOAD
• Browser DefenderThe Browser Defender™ toolbar allows you to surf safely by displaying site..DOWNLOAD
• Browser Password DecryptorBrowser Password Decryptor is a free program to instantly recover website login..DOWNLOAD

Xpressive 2 0 0 Download Free Version

Xpressive 2 0 0 Download Free Pc Games

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