https://developers.google.com/chart/interactive/docs/gallery/controls?csw=1#stringfilter
matchTypestring'prefix'Whether the control should match exact values only (
'exact'), prefixes starting from the beginning of the value ('prefix') or
any substring ('any').
Just spotted 'any' , never seen that before, it's a start for multiple
columns.
Seems to work well...
http://jsfiddle.net/sM4f6/1/
I'll try a few variations maybe multiple input boxes or fixed / pre-
populated filter controls from the playground.
https://code.google.com/apis/ajax/playground/#stringfilter_control
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