escaping wildcards in obejct search

In a "Find Database Object' window, I'd like to find, say, all packages with an underscore ("_") in their name. In the Name field, I put '%_%' which of course is interpreted as 'match any number of characters' + 'match one character' + 'match any number of characters'.

In this search, is there any way to escape wildcard characters so that they are not treated as wildcards?

Thanks!
 
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