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That is, both PCRE and Perl disallow variable-length patterns using quantifiers within lookbehind assertions. However, Perl requires all alternative branches of a lookbehind assertion to be the same length as each other, whereas PCRE allows those alternative branches to have different lengths from each other as long as each branch still has a ...
Perl v5.6.0 released: Version numbering changed to 'revision.version.subversion' format; Internal representation for strings is changed to UTF-8, with EBCDIC support discontinued. Better support for interpreter concurrency. String literals can be written using character ordinals. New syntax for subroutine attributes. (The attrs pragma is now ...
Raku programming language (formerly Perl 6) uses utf-8 encoding by default for I/O (Perl 5 also supports it); though that choice in Raku also implies "normalization into Unicode NFC (normalization form canonical). In some cases you may want to ensure no normalization is done; for this you can use utf8-c8". [69]
Unicode code points in the following code point ranges are always valid in XML 1.1 documents: [2] U+0001–U+D7FF, U+E000–U+FFFD: this includes most C0 and C1 control characters, but excludes some (not all) non-characters in the BMP (surrogates, U+FFFE and U+FFFF are forbidden);
As of 2010, the standard module is generally regarded as deprecated; [2] often recommended libraries are pcre (with full support for PCRE) and re (which is not as complete but claims better performance and provides frontends to popular syntaxes: PCRE, Perl, Posix, Emacs, shell globbing). Perl: Perl.com
This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (July 2019) (Learn how and when to remove this message) This article compares Unicode encodings in two types of environments: 8-bit clean environments, and environments that forbid the use of byte values with the ...
Unicode equivalence is the specification by the Unicode character encoding standard that some sequences of code points represent essentially the same character. This feature was introduced in the standard to allow compatibility with pre-existing standard character sets, which often included similar or identical characters.
To use Unicode in the domain part of email addresses, IDNA encoding must traditionally be used. Alternatively, SMTPUTF8 [3] allows the use of UTF-8 encoding in email addresses (both in a local part and in domain name) as well as in a mail header section. Various standards had been created to retrofit the handling of non-ASCII data to the ...