To filter a specific url from the results, just add a | where url!="tcp://edge-chat.facebook.com/"
There are multiple solutions for stripping tcp, http, https, etc...
example 1 using eval replace: | eval url=replace(url, "tcp://", "")
example 2 using rex to extract then drop old field and rename new (can't just extract and overwrite):
| rex field=url "([chpt]://)(?.*)"
| fields - url
| rename urla AS url
example 3 in case you want to reformat specific url only, combine multiple eval functions:
| eval url=if(url="tcp://edge-chat.facebook.com/", replace(url, "tcp://", ""), url)
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