You are concatenating fields, not pattern matching correct? Assuming these are two data items you can unlock the report and physically place the two data items together, using a text object to create spacing if needed.
Unlock:

Drop the data item inside the other (in the body, not the header) Here we already have Project Number and want to add Project Name right along side it.

End result:

You can apply column title formatting to change the name, insert text between the two data items (I inserted 2 spaces which is why mine are spaced apart) and such... When you run the report it appears as:
9999999 Project X
Steve Thompson | Sr. Solutions Consultant
Daptiv