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Linebreak options such as (*LF) documented above; backslash-R options such as (*BSR_ANYCRLF) documented above; Unicode Character Properties option (*UCP) documented above; (*UTF8) option documented as follows: if PCRE2 has been compiled with UTF support, the (*UTF) option at the beginning of a pattern can be used instead of setting an external ...
The default string primitive in Go, [50] Julia, Rust, Swift (since version 5), [51] and PyPy [52] uses UTF-8 internally in all cases. Python (since version 3.3) uses UTF-8 internally for Python C API extensions [53] [54] and sometimes for strings [53] [55] and a future version of Python is planned to store strings as UTF-8 by default.
ICU has historically used UTF-16, and still does only for Java; while for C/C++ UTF-8 is supported, [5] [6] including the correct handling of "illegal UTF-8". [7] ICU 73.2 has improved significant changes for GB18030-2022 compliance support, i.e. for Chinese (that updated Chinese GB18030 Unicode Transformation Format standard is slightly ...
Python: python.org: Python Software Foundation License: Python has two major implementations, the built in re and the regex library. Ruby: ruby-doc.org: GNU Library General Public License: Ruby 1.8, Ruby 1.9, and Ruby 2.0 and later versions use different engines; Ruby 1.9 integrates Oniguruma, Ruby 2.0 and later integrate Onigmo, a fork from ...
In Unicode, the implicit directional mark characters are encoded at U+061C ARABIC LETTER MARK, U+200E LEFT-TO-RIGHT MARK (‎) and U+200F RIGHT-TO-LEFT MARK (‏). In UTF-8 these are D8 9C, E2 80 8E and E2 80 8F respectively. Usage is prescribed in the Unicode Bidirectional Algorithm. [1]
The same character converted to UTF-8 becomes the byte sequence EF BB BF. The Unicode Standard allows the BOM "can serve as a signature for UTF-8 encoded text where the character set is unmarked". [75] Some software developers have adopted it for other encodings, including UTF-8, in an attempt to distinguish UTF-8 from local 8-bit code pages.
Python 2 also distinguishes two types of strings: 8-bit ASCII ("bytes") strings (the default), explicitly indicated with a b or B prefix, and Unicode strings, indicated with a u or U prefix. [25] while in Python 3 strings are Unicode by default and bytes are a separate bytes type that when initialized with quotes must be prefixed with a b.
Python 3.15 will "Make UTF-8 mode default", [70] the mode exists in all current Python versions, but currently needs to be opted into. UTF-8 is already used, by default, on Windows (and elsewhere), for most things, but e.g. to open files it's not and enabling also makes code fully cross-platform, i.e. use UTF-8 for everything on all platforms.