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ComboBox partial in string matching

Is it possible to filter items in a combo matching not only the first part of a string, but also fragments?
Example:

With an option list like:
adsdasXXXjsdf
XXXjhsdfsfhjfsdjk
hdsfjhXXX
fsdsdfYYY
addasYYY
YYYjjksdfjk

Match XXX to those options:
adsdasXXXjsdf
XXXjhsdfsfhjfsdjk
hdsfjhXXX

Or match YYY to those options:
fsdsdfYYY
addasYYY
YYYjjksdfjk

Actually I obtain with XXX only one match:
XXXjhsdfsfhjfsdjk

Thanks,
Andrea frigo

Can be achieved only by code modification

dhtmlxcombo.js , line 980
     try{ var filter=new RegExp("^"+text,"i"); }  
can be replaced with 
     try{ var filter=new RegExp(text,"i"); }  

with such modification, filter will react on any occurence of entered text