f1131623_sion_Reference__Special_Groups__Description
[Feature] Lookbehind [Syntax] (?<=regex) [Example] (?<=s+t matches only the fourth t in twisty streets. [JGsoft] YES [.NET] YES [Java] no [Perl] no [PCRE] no [PCRE2] no [PHP] no [Delphi] no [R] no [JavaScript] n/a [VBScript] n/a [XRegExp] n/a [Python] no [Ruby] no [std::regex] n/a [Tcl ARE] n/a [POSIX BRE] n/a [POSIX ERE] n/a [GNU BRE] n/a [GNU ERE] n/a [Oracle] n/a [XML] n/a [XPath] n/a [Description] 
The full regular expression syntax can be used inside lookbehind.
Regular Expression Reference: Special Groups