3604074 Fix regexp optimization to stop hanging on the expression

((((((((a)*)*)*)*)*)*)*)* .  Thanks to Bjørn Grathwohl for discovery.

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/regexp.test b/tests/regexp.test
index 7cafd1b..21f5720 100644
--- a/tests/regexp.test
+++ b/tests/regexp.test
@@ -819,6 +819,10 @@ test regexp-22.1 {Bug 1810038} {
 test regexp-22.2 {regexp compile and backrefs, Bug 1857126} {
     regexp -- {([bc])\1} bb
 } 1
+test regexp-22.3 {Bug 3604074} {
+    # This will hang in interps where the bug is not fixed
+    regexp ((((((((a)*)*)*)*)*)*)*)* a
+} 1
 
 test regexp-23.1 {regexp -all and -line} {
     set string ""