In .NET it’s idiomatic to avoid exceptions for control flow because “it failed to parse” means creating an exception which costs you an allocation and getting the stack trace, among other things.
The allocation is plenty cheap, but creating the stack trace is expensive in pretty much all structured exception systems, and it is noticeable in loops, not necessarily even really tight ones.
So yeah if you’re parsing thousands of url candidates and expect many will not parse, don’t use exceptions to communicate the expected errors. Otherwise don’t worry about it.
