Christoph Thiede uploaded a new version of Regex-Core to project The Trunk:
http://source.squeak.org/trunk/Regex-Core-ct.79.mcz

==================== Summary ====================

Name: Regex-Core-ct.79
Author: ct
Time: 11 October 2022, 3:09:29.215455 pm
UUID: b733e45e-0504-774d-967a-7e4c4bb892cd
Ancestors: Regex-Core-ct.78

Fixes regression in lookarounds with branches. See Regex-Tests-Core-ct.31.

=============== Diff against Regex-Core-ct.78 ===============

Item was changed:
  ----- Method: RxMatcher>>syntaxRegex: (in category 'double dispatch') -----
  syntaxRegex: regexNode
  	"Double dispatch from the syntax tree.
  	Regex node is a chain of branches to be tried. Should compile this into a bundle of parallel branches, between two marker nodes."
  
  	| startNode endNode alternatives |
+ 	regexNode isCapturing
+ 		ifTrue: [
+ 			startNode := RxmMarker new index: self allocateMarker.
+ 			endNode := RxmMarker new index: self allocateMarker]
+ 		ifFalse: [
+ 			endNode := RxmLink new "A single endNode is required that all branches of the answer must point to for termination."].
- 	regexNode isCapturing ifFalse: [
- 		^ regexNode branch dispatchTo: self].
  	
- 	startNode := RxmMarker new index: self allocateMarker.
- 	endNode := RxmMarker new index: self allocateMarker.
- 	
  	regexNode key ifNotNil: [:key |
  		self registerMarkerKey: key from: startNode index to: endNode index].
  	
  	alternatives := self hookBranchOf: regexNode onto: endNode.
+ 	startNode ifNil: [^ alternatives].
  	^ startNode
  		pointTailTo: alternatives;
  		yourself!