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Do not validate a backreference if the group that it refers to is not valid

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Aadhavan Srinivasan
2025-02-11 19:12:58 -05:00
parent 2934e7a20f
commit 81b8b1b11c
1 changed files with 1 additions and 1 deletions
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2
regex/matching.go
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@@ -319,7 +319,7 @@ func findAllSubmatchHelper(start *nfaState, str []rune, offset int, numGroups in
if currentState.contentContains(str, idx, preferLongest) { if currentState.contentContains(str, idx, preferLongest) {
nextStates = addStateToList(str, idx+1, nextStates, *currentState.next, currentState.threadGroups, nil, preferLongest) nextStates = addStateToList(str, idx+1, nextStates, *currentState.next, currentState.threadGroups, nil, preferLongest)
} }
} else if currentState.isBackreference { } else if currentState.isBackreference && currentState.threadGroups[currentState.referredGroup].IsValid() {
groupLength := currentState.threadGroups[currentState.referredGroup].EndIdx - currentState.threadGroups[currentState.referredGroup].StartIdx groupLength := currentState.threadGroups[currentState.referredGroup].EndIdx - currentState.threadGroups[currentState.referredGroup].StartIdx
if currentState.threadBackref == groupLength { if currentState.threadBackref == groupLength {
currentState.threadBackref = 0 currentState.threadBackref = 0