f1131623_sion_Reference__Special_Groups__Description
[Feature] Keep text out of the regex match [Syntax] \K [Example] s\Kt matches only the first t in streets. [JGsoft] no [.NET] no [Java] no [Perl] 5.10 [PCRE] 7.2 [PCRE2] YES [PHP] 5.2.4 [Delphi] YES [R] YES [JavaScript] no [VBScript] no [XRegExp] no [Python] no [Ruby] 2.0 [std::regex] no [Tcl ARE] no [POSIX BRE] no [POSIX ERE] no [GNU BRE] no [GNU ERE] no [Oracle] no [XML] no [XPath] no [Description] 
The text matched by the part of the regex to the left of the \K is omitted from the overall regex match. Other than that the regex is matched normally from left to right. Capturing groups to the left of the \K capture as usual.
Regular Expression Reference: Special Groups