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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:unicode Unicode and Boost.Regex]
- There are two ways to use Boost.Regex with Unicode strings:
- [h4 Rely on wchar_t]
- If your platform's `wchar_t` type can hold Unicode strings, and your
- platform's C/C++ runtime correctly handles wide character constants
- (when passed to `std::iswspace` `std::iswlower` etc), then you can use
- `boost::wregex` to process Unicode. However, there are several
- disadvantages to this approach:
- * It's not portable: there's no guarantee on the width of `wchar_t`, or
- even whether the runtime treats wide characters as Unicode at all,
- most Windows compilers do so, but many Unix systems do not.
- * There's no support for Unicode-specific character classes: `[[:Nd:]]`, `[[:Po:]]` etc.
- * You can only search strings that are encoded as sequences of wide
- characters, it is not possible to search UTF-8, or even UTF-16 on many platforms.
- [h4 Use a Unicode Aware Regular Expression Type.]
- If you have the
- [@http://www.ibm.com/software/globalization/icu/ ICU library], then
- Boost.Regex can be
- [link boost_regex.install.building_with_unicode_and_icu_su
- configured to make use
- of it], and provide a distinct regular expression type (boost::u32regex),
- that supports both Unicode specific character properties, and the searching
- of text that is encoded in either UTF-8, UTF-16, or UTF-32. See:
- [link boost_regex.ref.non_std_strings.icu
- ICU string class support].
- [endsect]
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