Just search exactly for '5\P4101 works for me
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This is the longway.--------->
You can do it with a space between View number and Sheet number with text warp when you first enter the value in the callout. Now after the fact that they already there, it will be more difficult to fix. I will try my best based on the example you provided:
- Edit the block and adjust the attribute width to allow text wrap. Attsync.
- Find '5' with match whole words checked. You will get 5 callouts highlighted. Create a selection set.
- Go back to drawing space with the selection. Mass edit the attribute content of the selection from the Properties Palette: delete the existing and enter '5 4101'.
- There you have all the 5/4101 callout fixed. You have to repeat for others.
This maybe more efficient than manually select on screen when you have lots of them at different places.
Another possibility is use an another more powerful external program to find and replace the text string from the dwg without destrying the drawing integrity. But I do not know of any myself.