Date matching in file name

Sorry to ask a silly question but I just can't get Hazel to recognise date patterns in file names like these:

Oct 2015ST.pdf
Nov 2015ST.pdf
Dec 2015ST.pdf
Jan 2016ST.pdf

The pattern is <mmm><space><yyyy>ST

I want the names changed to <yyyy>-<mm> <myname.pdf>

I have tried a condition: <Name> <matches> <custom date>. The <cusotm date> is in the format <Dec><space><2015>ST

I have tried variations on that theme—none of which work.

What am I doing wrong?

Thank you in anticipation.

Do they match in the preview? If so, then the problem may be in your actions and not in the conditions.

No—they do not match the preview. And that's what's driving me crazy.

But the problem must have been with me, as I tested the elements one by one to see what would display in the preview and miraculously it all works now provided I set the pattern without the extension.

I now figure that the condition <Name> is different to <Full Name> but I didn't think to open that parameter and wrongly assumed that "name" was "name and/or extension."

Thank you Mr Noodle: you have the magic touch.