Note that PCRE is far less flexible in what it allows for the \p tokens, despite its name “Perl-compatible”. PCRE can optionally be compiled with Unicode support. Perl supports Unicode starting with version 5.6. Of the regex flavors discussed in this tutorial, Java, XML and.
Unfortunately, Unicode brings its own requirements and pitfalls when it comes to regular expressions. Using different character sets for different languages is simply too cumbersome for programmers and users. With more and more software being required to support multiple languages, or even just any language, Unicode has been strongly gaining popularity in recent years. Unicode is a character set that aims to define all characters and glyphs from all human languages, living and dead.
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