.*?(?:(\w)|(\w))x abx y $1-$2 b-
0{50} 000000000000000000000000000000000000000000000000000 y - -
-^a?(?=b)b ab B $& ab # Bug #56690
-^a*(?=b)b ab B $& ab # Bug #56690
+^a?(?=b)b ab y $& ab # Bug #56690
+^a*(?=b)b ab y $& ab # Bug #56690
/>\d+$ \n/ix >10\n y $& >10
/>\d+$ \n/ix >1\n y $& >1
/\d+$ \n/ix >10\n y $& 10