foursquare/fongo — pull request #24 by dm3 (2013-03-25 13:14:07+00:00)
Title: Add regex support to $all query

Regex is allowed inside of `$all` operation, so

db.test.insert({name: 'john johnson', keywords: ['john', 'johnson']});
db.test.find({keywords: {$all: ['john', /^jo/]}});

should return one result.