Binary properties are a kind of Unicode property that flavors may support. They are called binary because a code point either has the property or not. Many flavors only support a limited number of binary properties. The fact that a flavor is built on a certain version of Unicode does not mean it supports all the binary properties that exist in that version of Unicode. The table below indicates which flavors support which properties. The exact code points matched by each property do depend on the Unicode version the flavor was built with.

The table below only uses the positive \p{Property} syntax. If the main Unicode reference page indicates that your flavor supports negated property syntax then all properties listed below as being supported can also be used with the negated syntax. So \P{Alphabetic} (with uppercase P) is equivalent to \p{Alphabetic=No}. Watch out for double negation. \P{Alphabetic=No} is equivalent to \p{Alphabetic=Yes}.

For the individual properties, the table indicates the number of code points that have the property and the Unicode planes that they are in. The number may be a range as newer Unicode versions may assign the property to new code points and even assign it to or remove it from old code points. If a property is only assigned to a few code points and those haven’t changed in past Unicode versions then the table shows a character class that matches all those code points. You can use that character class instead of the property if your regex flavor does not support the property. If the character class includes SMP characters then it will only work correctly if your regex flavor properly handles astral characters.

Some Unicode properties are derived properties because they are based on other properties. For such properties, the table uses regex syntax to describe the formula for deriving the property. These regexes are only intended as descriptions. You should use the actual derived property in your own regexes. If your regex flavor doesn’t support the derived property then it most likely won’t support the descriptive regex either.

JGsoft Python JavaScript VBScript XRegExp .NET Java ICU RE2 Perl PCRE PCRE2 PHP Delphi R Ruby std::regex Boost Tcl POSIX GNU Oracle XML XPath JGsoft Python JavaScript VBScript XRegExp .NET Java ICU RE2 Perl PCRE PCRE2 PHP Delphi R Ruby std::regex Boost Tcl POSIX GNU Oracle XML XPath