id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6493	Problem in using regex to find nested tags	little_bird@…	John Maddock	"I want to use regex to find all `""<NPC></NPC>""` like tags in a text file, and tags may recursive. So I made an example, using patterns


`<(?<HtmlTag>NPC)>((?<Nested><\k<HtmlTag>>)|</\k<HtmlTag>>(?<-Nested>)|.*?)*</\k<HtmlTag>>`


to search string


`abc<NPC><NPC>12345</NPC>1</NPC>2<NPC>3</NPC>`


Well, it works well in Expresso(a cool tool in making and testing regular expressions, can be found at `http://www.ultrapico.com/`). But by using boost::regex_search, it returns the whole string. It seems that the 3rd `""<NPC>""` matches `"".*?""` but `""</\k<HtmlTag>>""`."	Bugs	closed	To Be Determined	regex	Boost 1.48.0	Problem	invalid	regex