I have a multiselect with search bound to a store (with attribute string_value). Search only searches strings that start with \"string to search\" instead of contains \"stri
The MultiSelector uses the Ext.util.Filter to narrow the results based on the typed text. You need to enable the anyMatch property for it to match anywhere.
To do that, you'll have to include a new "search" function in your multiselector's search object that will have anyMatch=true.
Please see my fiddle, https://fiddle.sencha.com/#fiddle/jf5, for an example of how to do this.