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I know this existed at least at some point in the past(no real indication what version that was for) and I keep running across references to it occasionally, but I just don't see it anymore, other than the search box suggestion the use of the "?" and "*" wildcards which aren't nearly enough, especially considering one of the things I need to look for in one filter is a literal question mark. Am I missing something?

No RSSOwl is not supporting RegEx in searches, sorry.

You're evidently much ore older than me in using RSSowl but what about entering : /? (not checked, though)

Are there any plans to re-introduce Regex functionality? I know somewhere I read that you'd like users to spread the word about this tool. The Regex feature would be a deal maker to me, to promote your tool. I work for a large organization (100K+ employees), and I use your tool everyday, but I'm somehow limited by the lack of Regex (or other more advanced) query language capabilities for my news filters and searches.

sorry, no plans for this. I tried to add it once, but the results where not satisfactory in terms of performance. note that rssowl is relying on apache lucene for searching which out of the box does not provide a regex search (at least from what I remember).

Just a quick note to second the motion to have some kind of advanced search, regex would really be great, but any other sophistication (such as 'starts with', 'ends with', etc.) would be really, really helpful. I use RSSOwl to filter my Google Reader feeds and it's proven to be invaluable in this job, but sometimes more advanced search capabilities would help to narrow the results. Anyway, thank you very much for such a great tool. Cheers, mprost