Marcel Taeumel uploaded a new version of Regex-Core to project The Trunk: http://source.squeak.org/trunk/Regex-Core-ct.60.mcz
==================== Summary ====================
Name: Regex-Core-ct.60 Author: ct Time: 8 July 2021, 12:56:00.161695 am UUID: 6ab872b9-268c-854c-96a3-9d743c137f20 Ancestors: Regex-Core-ct.59
Fixes lookbehinds in particular optional/repeatable groups. See Regex-Tests-Core-ct.13.
Note that is only the tip of the iceberg; unfortunately, I discovered even more serious with lookbehind expresion in nullable groups (see Regex-Tests-Core.ct14). Nevertheless, I'd like to see this particular patch earlier in the Trunk as it at least fixes simple cases like in the test; there seem to be two independent defects in the implementation (one of which is fixed hereby).
=============== Diff against Regex-Core-ct.59 ===============
Item was changed: ----- Method: RxMatcher>>matchAgainstLookbehind:positive:nextLink: (in category 'matching') ----- matchAgainstLookbehind: lookbehind positive: positive nextLink: anRmxLink
| position matchesLookbehind | position := stream position. matchesLookbehind := (position to: 0 by: -1) anySatisfy: [:index | stream position: index. (lookbehind matchAgainst: self) and: [stream position = position]]. + stream position: position. matchesLookbehind = positive ifFalse: [^ false]. - stream position: position. ^ anRmxLink matchAgainst: self!