Unicode Support
The Unicode character set gives unique numbers to the characters in all the worldâs languages. Because of the large number of possible characters, Unicode requires more than one byte to represent a character. Some regular expression implementations will not understand Unicode characters because they expect 1 byte ASCII characters. Basic support for Unicode characters starts with the ability to match a literal string of Unicode characters. Advanced support includes character classes and other constructs that incorporate characters from all Unicode-supported languages. For example, \w might match è; as well as e.
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