Does Dolphin's filter bar support boolean queries? Say I want to show all *.mp4 and *.m4v files in a folder. Could I enter a string in the filter bar that would effectively give what one would expect by "mp4 OR m4v"?

If this is not implemented, it definitely should be!

try

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*.m[p4][4v]

it supports globbing (http://doc.qt.io/qt-4.8/qregexp.html#PatternSyntax-enum - QRegExp::WildcardUnix)

What you want is "true" RegExp matching

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.*\.(mp4|m4v)\b

which is probably not considered "idiot proof" enough - or commonly expected

Genius! Thanks!

To prevent misconceptions, mp4 & m4v is a very specific char combination, leading to an ambigious

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*.m[p4][4v]

So, for disambiguation:

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*.[ma][pv][4i]

matches *.mp4 and *.avi (and some more combinations