Support of \K in regex

The \K escape sequence is supported by several engines, languages or tools, such as:

• boost (since ???)
• grep -P ——————–⇢ Uses PCRE
• Oniguruma (since 5.13.3)
• PCRE (since 7.2)
• Perl (since 5.10.0)
• PHP (since 5.2.4)
• Ruby (since 2.0.0 due to its use of the Onigmo engine (a fork of Oniguruma))
• Notepad++ (since 6.0)

…and (so far) not supported by:

• .NET
• awk
• bash
• ICU
• Java
• Javascript
• Objective-C
• POSIX
• Python
• Qt/QRegExp
• sed
• Tcl
• vim ——————–⇢ It doesn’t have \K, but its \zs is equivalent
• XML
• XPath