Use a derived column.
You can either add it as a new column or choose the Replace 'ColumnName' option
Give it a formula like:
FINDSTRING("abc", [MyInputColumn],1 ) > 0 ? [MyInputColumn] : ""
the "?" indicates an IF, the first value after the ? is the true branch and after the ":" is the false branch.
Formula language isn't pretty but that would give you what you need.
You could also code this in VB.net or C#.net with a script component setup as a transformation.
I almost like that better and would definitely use it if the logic gets complicated, nested IF's in formula language are a bear.
Additional resource:
http://msdn.microsoft.com/en-us/library/ms141671.aspx