Why is Splunk 6.5.1 not able to search when event has data with delimiter ~ while field extraction is working as expected?

Why is Splunk 6.5.1 not able to search when event has data with delimiter `~`, while field extraction is working as expected. Issue with search with extracted field=value another question while extracting fields i was using !#! as separator but its not working. Can't we use multiple characters as separator !#! ? Thanks Neeraj Singh Dhapola