It would be valuable to be able to search for a specific text string/condition/regex/etc within the entire list of filters a User has already created. There are many times when the User knows that a particular string/condition/etc has been included in a filter but can't remember exactly which filter it was. By enabling a search function over the filter list the User could easily find which filter had the respective text string/condition/regex/etc and then go to it and modify/delete/add to that rule(s) instead of having multiple filters with similar conditions.
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Everything else (Inbox Tab and Recycle Bin Tab) seems to already have it's own Search Function but what I could really really use from time/time is a Search Function that searched the Filters for ANY type Text String (Plain Text, Regex Code, Email Address, etc.).
There are many times I know that I've had hits on certain text strings (one type or another) previously but don't recall for sure which filter it was that had the hit. If I could search the Filter stack for a specific Text String w/o regard to whether or not it was Plain Text, a Regex, an Email Address or some other string, it would help me locate the particular Filter I want to modify that much easier. And if I end up not getting a hit (which means I must have been dreaming) then I would know right away that I need to create a new Filter, thus again speeding the process.
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Write a search function for the filters, so that I can easily find conflicts.