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<h1 align="center">Boost.Regex</h1>
<h2 align="center">Localisation</h2>
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<p>Boost.regex provides extensive support for run-time localization, the
localization model used can be split into two parts: front-end and back-end.</p>
<p>Front-end localization deals with everything which the user sees - error
messages, and the regular expression syntax itself. For example a French
application could change [[:word:]] to [[:mot:]] and \w to \m. Modifying the
front end locale requires active support from the developer, by providing the
library with a message catalogue to load, containing the localized strings.
Front-end locale is affected by the LC_MESSAGES category only.</p>
<p>Back-end localization deals with everything that occurs after the expression
has been parsed - in other words everything that the user does not see or
interact with directly. It deals with case conversion, collation, and character
class membership. The back-end locale does not require any intervention from
the developer - the library will acquire all the information it requires for
the current locale from the underlying operating system / run time library.
This means that if the program user does not interact with regular expressions
directly - for example if the expressions are embedded in your C++ code - then
no explicit localization is required, as the library will take care of
everything for you. For example embedding the expression [[:word:]]+ in your
code will always match a whole word, if the program is run on a machine with,
for example, a Greek locale, then it will still match a whole word, but in
Greek characters rather than Latin ones. The back-end locale is affected by the
LC_TYPE and LC_COLLATE categories.</p>
<p>There are three separate localization mechanisms supported by boost.regex:</p>
<h3>Win32 localization model.</h3>
<p>This is the default model when the library is compiled under Win32, and is
encapsulated by the traits class w32_regex_traits. When this model is in effect
each basic_regex object gets it's own LCID, by default this is the users
default setting as returned by GetUserDefaultLCID, but you can call <EM>imbue</EM>
on the basic_regex object to set it's locale to some other LCID if you wish.
All the settings used by boost.regex are acquired directly from the operating
system bypassing the C run time library. Front-end localization requires a
resource dll, containing a string table with the user-defined strings. The
traits class exports the function:</p>
<p>static std::string set_message_catalogue(const std::string& s);</p>
<p>which needs to be called with a string identifying the name of the resource
dll, <i>before</i> your code compiles any regular expressions (but not
necessarily before you construct any <i>basic_regex</i> instances):</p>
<p>
boost::w32_regex_traits<char>::set_message_catalogue("mydll.dll");</p>
<p>
The library provides full Unicode support under NT, under Windows 9x the
library degrades gracefully - characters 0 to 255 are supported, the remainder
are treated as "unknown" graphic characters.</p>
<h3>C localization model.</h3>
<p>This model has been deprecated in favor of the C++ localoe for all non-Windows
compilers that support it. This locale is encapsulated by the traits
class <i>c_regex_traits</i>, Win32 users can force this model to take effect by
defining the pre-processor symbol BOOST_REGEX_USE_C_LOCALE. When this model is
in effect there is a single global locale, as set by <i>setlocale</i>. All
settings are acquired from your run time library, consequently Unicode support
is dependent upon your run time library implementation.</p>
<P>Front end localization is not supported.</P>
<P>Note that calling <i>setlocale</i> invalidates all compiled regular
expressions, calling <tt>setlocale(LC_ALL, "C")</tt> will make this library
behave equivalent to most traditional regular expression libraries including
version 1 of this library.</P>
<h3>C++ localization model.</h3>
<p>This model is the default for non-Windows compilers.</p>
<P>
When this model is in effect each instance of basic_regex<> has its own
instance of std::locale, class basic_regex<> also has a member function <i>imbue</i>
which allows the locale for the expression to be set on a per-instance basis.
Front end localization requires a POSIX message catalogue, which will be loaded
via the std::messages facet of the expression's locale, the traits class
exports the symbol:</P>
<p>static std::string set_message_catalogue(const std::string& s);</p>
<p>which needs to be called with a string identifying the name of the message
catalogue, <i>before</i> your code compiles any regular expressions (but not
necessarily before you construct any <i>basic_regex</i> instances):</p>
<p>
boost::cpp_regex_traits<char>::set_message_catalogue("mycatalogue");</p>
<p>Note that calling basic_regex<>::imbue will invalidate any expression
currently compiled in that instance of basic_regex<>.</p>
<P>Finally note that if you build the library with a non-default localization
model, then the appropriate pre-processor symbol (BOOST_REGEX_USE_C_LOCALE or
BOOST_REGEX_USE_CPP_LOCALE) must be defined both when you build the support
library, and when you include <boost/regex.hpp> or
<boost/cregex.hpp> in your code. The best way to ensure this is to add
the #define to <boost/regex/user.hpp>.</P>
<h3>Providing a message catalogue:</h3>
<p>
In order to localize the front end of the library, you need to provide the
library with the appropriate message strings contained either in a resource
dll's string table (Win32 model), or a POSIX message catalogue (C++ models). In
the latter case the messages must appear in message set zero of the catalogue.
The messages and their id's are as follows:<br>
</p>
<p></p>
<table id="Table2" cellspacing="0" cellpadding="6" width="624" border="0">
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">Message id</td>
<td valign="top" width="32%">Meaning</td>
<td valign="top" width="29%">Default value</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">101</td>
<td valign="top" width="32%">The character used to start a sub-expression.</td>
<td valign="top" width="29%">"("</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">102</td>
<td valign="top" width="32%">The character used to end a sub-expression
declaration.</td>
<td valign="top" width="29%">")"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">103</td>
<td valign="top" width="32%">The character used to denote an end of line
assertion.</td>
<td valign="top" width="29%">"$"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">104</td>
<td valign="top" width="32%">The character used to denote the start of line
assertion.</td>
<td valign="top" width="29%">"^"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">105</td>
<td valign="top" width="32%">The character used to denote the "match any character
expression".</td>
<td valign="top" width="29%">"."</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">106</td>
<td valign="top" width="32%">The match zero or more times repetition operator.</td>
<td valign="top" width="29%">"*"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">107</td>
<td valign="top" width="32%">The match one or more repetition operator.</td>
<td valign="top" width="29%">"+"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">108</td>
<td valign="top" width="32%">The match zero or one repetition operator.</td>
<td valign="top" width="29%">"?"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">109</td>
<td valign="top" width="32%">The character set opening character.</td>
<td valign="top" width="29%">"["</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">110</td>
<td valign="top" width="32%">The character set closing character.</td>
<td valign="top" width="29%">"]"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">111</td>
<td valign="top" width="32%">The alternation operator.</td>
<td valign="top" width="29%">"|"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">112</td>
<td valign="top" width="32%">The escape character.</td>
<td valign="top" width="29%">"\\"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">113</td>
<td valign="top" width="32%">The hash character (not currently used).</td>
<td valign="top" width="29%">"#"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">114</td>
<td valign="top" width="32%">The range operator.</td>
<td valign="top" width="29%">"-"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">115</td>
<td valign="top" width="32%">The repetition operator opening character.</td>
<td valign="top" width="29%">"{"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">116</td>
<td valign="top" width="32%">The repetition operator closing character.</td>
<td valign="top" width="29%">"}"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">117</td>
<td valign="top" width="32%">The digit characters.</td>
<td valign="top" width="29%">"0123456789"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">118</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the word boundary assertion.</td>
<td valign="top" width="29%">"b"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">119</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the non-word boundary assertion.</td>
<td valign="top" width="29%">"B"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">120</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the word-start boundary assertion.</td>
<td valign="top" width="29%">"<"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">121</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the word-end boundary assertion.</td>
<td valign="top" width="29%">">"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">122</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any word character.</td>
<td valign="top" width="29%">"w"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">123</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents a non-word character.</td>
<td valign="top" width="29%">"W"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">124</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents a start of buffer assertion.</td>
<td valign="top" width="29%">"`A"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">125</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents an end of buffer assertion.</td>
<td valign="top" width="29%">"'z"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">126</td>
<td valign="top" width="32%">The newline character.</td>
<td valign="top" width="29%">"\n"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">127</td>
<td valign="top" width="32%">The comma separator.</td>
<td valign="top" width="29%">","</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">128</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the bell character.</td>
<td valign="top" width="29%">"a"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">129</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the form feed character.</td>
<td valign="top" width="29%">"f"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">130</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the newline character.</td>
<td valign="top" width="29%">"n"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">131</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the carriage return character.</td>
<td valign="top" width="29%">"r"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">132</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the tab character.</td>
<td valign="top" width="29%">"t"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">133</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the vertical tab character.</td>
<td valign="top" width="29%">"v"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">134</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the start of a hexadecimal character constant.</td>
<td valign="top" width="29%">"x"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">135</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the start of an ASCII escape character.</td>
<td valign="top" width="29%">"c"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">136</td>
<td valign="top" width="32%">The colon character.</td>
<td valign="top" width="29%">":"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">137</td>
<td valign="top" width="32%">The equals character.</td>
<td valign="top" width="29%">"="</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">138</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the ASCII escape character.</td>
<td valign="top" width="29%">"e"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">139</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any lower case character.</td>
<td valign="top" width="29%">"l"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">140</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any non-lower case character.</td>
<td valign="top" width="29%">"L"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">141</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any upper case character.</td>
<td valign="top" width="29%">"u"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">142</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any non-upper case character.</td>
<td valign="top" width="29%">"U"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">143</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any space character.</td>
<td valign="top" width="29%">"s"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">144</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any non-space character.</td>
<td valign="top" width="29%">"S"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">145</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any digit character.</td>
<td valign="top" width="29%">"d"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">146</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any non-digit character.</td>
<td valign="top" width="29%">"D"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">147</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the end quote operator.</td>
<td valign="top" width="29%">"E"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">148</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the start quote operator.</td>
<td valign="top" width="29%">"Q"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">149</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents a Unicode combining character sequence.</td>
<td valign="top" width="29%">"X"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">150</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents any single character.</td>
<td valign="top" width="29%">"C"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">151</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents end of buffer operator.</td>
<td valign="top" width="29%">"Z"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="21%">152</td>
<td valign="top" width="32%">The character which when preceded by an escape
character represents the continuation assertion.</td>
<td valign="top" width="29%">"G"</td>
<td valign="top" width="9%"> </td>
</tr>
<tr>
<td> </td>
<td>153</td>
<td>The character which when preceeded by (? indicates a zero width negated
forward lookahead assert.</td>
<td>!</td>
<td> </td>
</tr>
</table>
<br>
<br>
<p>Custom error messages are loaded as follows: </p>
<p></p>
<table id="Table3" cellspacing="0" cellpadding="7" width="624" border="0">
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">Message ID</td>
<td valign="top" width="32%">Error message ID</td>
<td valign="top" width="31%">Default string</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">201</td>
<td valign="top" width="32%">REG_NOMATCH</td>
<td valign="top" width="31%">"No match"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">202</td>
<td valign="top" width="32%">REG_BADPAT</td>
<td valign="top" width="31%">"Invalid regular expression"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">203</td>
<td valign="top" width="32%">REG_ECOLLATE</td>
<td valign="top" width="31%">"Invalid collation character"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">204</td>
<td valign="top" width="32%">REG_ECTYPE</td>
<td valign="top" width="31%">"Invalid character class name"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">205</td>
<td valign="top" width="32%">REG_EESCAPE</td>
<td valign="top" width="31%">"Trailing backslash"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">206</td>
<td valign="top" width="32%">REG_ESUBREG</td>
<td valign="top" width="31%">"Invalid back reference"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">207</td>
<td valign="top" width="32%">REG_EBRACK</td>
<td valign="top" width="31%">"Unmatched [ or [^"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">208</td>
<td valign="top" width="32%">REG_EPAREN</td>
<td valign="top" width="31%">"Unmatched ( or \\("</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">209</td>
<td valign="top" width="32%">REG_EBRACE</td>
<td valign="top" width="31%">"Unmatched \\{"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">210</td>
<td valign="top" width="32%">REG_BADBR</td>
<td valign="top" width="31%">"Invalid content of \\{\\}"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">211</td>
<td valign="top" width="32%">REG_ERANGE</td>
<td valign="top" width="31%">"Invalid range end"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">212</td>
<td valign="top" width="32%">REG_ESPACE</td>
<td valign="top" width="31%">"Memory exhausted"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">213</td>
<td valign="top" width="32%">REG_BADRPT</td>
<td valign="top" width="31%">"Invalid preceding regular expression"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">214</td>
<td valign="top" width="32%">REG_EEND</td>
<td valign="top" width="31%">"Premature end of regular expression"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">215</td>
<td valign="top" width="32%">REG_ESIZE</td>
<td valign="top" width="31%">"Regular expression too big"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">216</td>
<td valign="top" width="32%">REG_ERPAREN</td>
<td valign="top" width="31%">"Unmatched ) or \\)"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">217</td>
<td valign="top" width="32%">REG_EMPTY</td>
<td valign="top" width="31%">"Empty expression"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">218</td>
<td valign="top" width="32%">REG_E_UNKNOWN</td>
<td valign="top" width="31%">"Unknown error"</td>
<td valign="top" width="7%"> </td>
</tr>
</table>
<br>
<br>
<p>Custom character class names are loaded as followed: </p>
<p></p>
<table id="Table4" cellspacing="0" cellpadding="7" width="624" border="0">
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">Message ID</td>
<td valign="top" width="32%">Description</td>
<td valign="top" width="31%">Equivalent default class name</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">300</td>
<td valign="top" width="32%">The character class name for alphanumeric characters.</td>
<td valign="top" width="31%">"alnum"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">301</td>
<td valign="top" width="32%">The character class name for alphabetic characters.</td>
<td valign="top" width="31%">"alpha"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">302</td>
<td valign="top" width="32%">The character class name for control characters.</td>
<td valign="top" width="31%">"cntrl"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">303</td>
<td valign="top" width="32%">The character class name for digit characters.</td>
<td valign="top" width="31%">"digit"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">304</td>
<td valign="top" width="32%">The character class name for graphics characters.</td>
<td valign="top" width="31%">"graph"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">305</td>
<td valign="top" width="32%">The character class name for lower case characters.</td>
<td valign="top" width="31%">"lower"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">306</td>
<td valign="top" width="32%">The character class name for printable characters.</td>
<td valign="top" width="31%">"print"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">307</td>
<td valign="top" width="32%">The character class name for punctuation characters.</td>
<td valign="top" width="31%">"punct"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">308</td>
<td valign="top" width="32%">The character class name for space characters.</td>
<td valign="top" width="31%">"space"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">309</td>
<td valign="top" width="32%">The character class name for upper case characters.</td>
<td valign="top" width="31%">"upper"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">310</td>
<td valign="top" width="32%">The character class name for hexadecimal characters.</td>
<td valign="top" width="31%">"xdigit"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">311</td>
<td valign="top" width="32%">The character class name for blank characters.</td>
<td valign="top" width="31%">"blank"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">312</td>
<td valign="top" width="32%">The character class name for word characters.</td>
<td valign="top" width="31%">"word"</td>
<td valign="top" width="7%"> </td>
</tr>
<tr>
<td valign="top" width="8%"> </td>
<td valign="top" width="22%">313</td>
<td valign="top" width="32%">The character class name for Unicode characters.</td>
<td valign="top" width="31%">"unicode"</td>
<td valign="top" width="7%"> </td>
</tr>
</table>
<br>
<br>
<p>Finally, custom collating element names are loaded starting from message id
400, and terminating when the first load thereafter fails. Each message looks
something like: "tagname string" where <i>tagname</i> is the name used inside
[[.tagname.]] and <i>string</i> is the actual text of the collating element.
Note that the value of collating element [[.zero.]] is used for the conversion
of strings to numbers - if you replace this with another value then that will
be used for string parsing - for example use the Unicode character 0x0660 for
[[.zero.]] if you want to use Unicode Arabic-Indic digits in your regular
expressions in place of Latin digits.</p>
<p>Note that the POSIX defined names for character classes and collating elements
are always available - even if custom names are defined, in contrast, custom
error messages, and custom syntax messages replace the default ones.</p>
<p></p>
<hr>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
26 June 2004
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i> Copyright John Maddock 1998-
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan --> 2004<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
<P><I>Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P>
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