Output:

C:\Temp>splice_tst.pl --debug --config --enter --config --config --enter --help
Before Array Splicing:
        --debug,--config,--enter,--config,--config,--enter,--help
Splicing Value: --config
--config is located at index(s): 1,3,4
Index:1
Index:2
Index:2
After Array Splicing:
        --debug,--enter,--enter,--help


Before Array Splicing:
        --debug,--enter,--enter,--help
Splicing Value: --enter
--enter is located at index(s): 1,2
Index:1
Index:1
After Array Splicing:
        --debug,--help



C:\Temp>