I am trying to rename a file

eg ABCD123456 where ABCD is a constant and 123456 is a variable

to be DCBA123456

How do I extract 123456 from the original file name?

Thanks in advance.

Is the constant of fixed length?

We may need a regex expert here for the best solution. I guess there are a lot of forums for that. Once you have the regex you can easily extract this and modify it the way you like.

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I had kinda the same question, Bob. My string was: CCYYMMDDOP520MMDDCCYY
I wanted the first 8 characters stripped away so that I ended up with : OP520MMDDCCYY

Support suggested the following
New name mask could be:

{STRING(Remove|{NEWNAME()}|0|8)}

so, for you, it looks like it should be:
{STRING(Remove|{NEWNAME()}|0|4)}

I will try this tomorrow.

DCBA{STRING(Right|{STRING(Replace|{NEWNAME()}|oldValue|newValue)}|6)}.DAT

I found that this worked in the end.