I have a folder of shapefiles and each one starts with a code.  There are multiple shapefiles that start with each code, and I would like to create a model in ModelBuilder that will select the shapefiles that have the same code, and append them into the appropriate existing geodatabase feature class.  

Is there a way to use a wildcard in the Append tool, like to specify that any and all files in a certain folder starting with 'XPGC*' get appended into the 'Pipe_Grade_Change' feature class?  Or is there a way to use an iterator to accomplish this?