Expression Tag like comand and writing a string

I am trying to do a like command on the first three digits of a int tag and output a string if true.if({Root Container.Report Viewer 1.Suspect} like 210%, 'PaintLine',0)

You can cast it to a string and use the left() function:

if(left(toStr({Root Container.Report Viewer 1.Suspect}),3)='210','PaintLine',0)