f1131623_sion_Reference__Special_Groups__Description
[Feature] Lookbehind [Syntax] (?<=x{n,m}) [Example] (?<=s\w{1,7})t matches only the fourth t in twisty streets. [JGsoft] YES [.NET] YES [Java] 6 4 fail [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] 
Quantifiers with a finite maximum number of repetitions can be used inside lookbehind.
Regular Expression Reference: Special Groups