Struct template regex

Struct template regex_compiler

boost::xpressive::regex_compiler — Class template regex_compiler is a factory for building basic_regex objects from a string.

Synopsis

template<typename BidiIter, typename RegexTraits, typename CompilerTraits> 
struct regex_compiler {
  // types
  typedef BidiIter                            iterator_type;  
  typedef iterator_value< BidiIter >::type    char_type;      
  typedef std::basic_string< char_type >      string_type;    
  typedef regex_constants::syntax_option_type flag_type;      
  typedef RegexTraits                         traits_type;    
  typedef traits_type::char_class_type        char_class_type;
  typedef traits_type::locale_type            locale_type;    

  // construct/copy/destruct
  regex_compiler(RegexTraits const & = RegexTraits());

  // public member functions
  locale_type imbue(locale_type) ;
  locale_type getloc() const;
  basic_regex< BidiIter > 
  compile(string_type, flag_type = regex_constants::ECMAScript) ;
};

Description

Class template regex_compiler is used to construct a basic_regex object from a string. The string should contain a valid regular expression. You can imbue a regex_compiler object with a locale, after which all basic_regex objects created with that regex_compiler object will use that locale. After creating a regex_compiler object, and optionally imbueing it with a locale, you can call the compile() method to construct a basic_regex object, passing it the string representing the regular expression. You can call compile() multiple times on the same regex_compiler object. Two basic_regex objects compiled from the same string will have different regex_id's.

`regex_compiler` construct/copy/destruct

regex_compiler(RegexTraits const & traits = RegexTraits());

`regex_compiler` public member functions

```
locale_type imbue(locale_type loc) ;
```
Specify the locale to be used by a regex_compiler.

Parameters:

loc
The locale that this regex_compiler should use.

Returns:
The previous locale.
```
locale_type getloc() const;
```
Get the locale used by a regex_compiler.

basic_regex< BidiIter > 
compile(string_type pat, flag_type flags = regex_constants::ECMAScript) ;

Builds a basic_regex object from a std::string.

Parameters:

`flags`	Optional bitmask that determines how the pat string is interpreted. (See syntax_option_type.)
`pat`	A std::string containing the regular expression pattern.

Requires:

The std::string pat contains a valid string-based representation of a regular expression.

Returns:

A basic_regex object corresponding to the regular expression represented by the string.

Throws: regex_error when the string has invalid regular expression syntax.