something like this should work:

Find: (\w)[\s\S]+

Change: $1

I'm creating a style guide and can form the running heads well using either native InDesign or PowerHeaders. I now want to create a running alphabetical index based on the same value found for the normal running head.

The example is:

My running head picks up a style, Topic, and creates correctly. Let's say the running head value is shown as "Telephone". I now want to be able to create a second running head with only the first letter of the word, ie, "T"...

My running heads would then shown on the page .... T Telephone...styled, of course...

I can;'t find a way to do this. Any ideas?