Capture filter syntax check - why no check before starting a session?

[Robert Kochem <robert () mailueberfall de>]

Hi Wireshark developers,

I am currently fighting again with the capture filter syntax. I want to
build a relatively complex filter which isn't that simple.

My major problem while developing the capture filter is that there is the
missing possibility to check the syntax of a filter. The only possibility
is to try starting a new capture session. 

I don't expect an real time checking while typing with highlighting but a
simple button for checking the syntax would be really great and would
improve the option dialog significantly. 

Additionally the "Invalid capture filter" error dialog does not give any
clue what part of the filter string caused the error. A little bit more
verboseness would be helpful here, too. 

Is there any chance to get those two changes implemented?

Robert

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