C:\TEMP\test>parenReplace.pl
String: $a($a hi) $a (($a))$a
LeftP:  2 13 14
RightP: 8 17 18
0 3 10 15 19
AP: 0 10 15 19
AP: 0 10 19
AP: 0 10 19
S: $b($a hi) $a (($a))$a
S: $b($a hi) $b (($a))$a
S: $b($a hi) $b (($a))$b