Split string on capital letter, not on multiple capital letters

[iamthesgt]

For a shell script used to automatically generate c++ code files, I have to split certain names apart for them to be formatted. I split them at a capital letter, but I do not want to split if there are multiple capital letters in sequence. For example:
I want this (and I get this):
ChanNameWordWrapMode -> Chan Name Word Wrap Mode
I want this:
ChanNameVAlign -> Chan Name VAlign
OSDSettings -> OSD Settings
But I get this:
ChanNameVAlign -> Chan Name V Align
OSDSettings -> O S D Settings.
The command I am using right now is:

`echo $string | sed 's/\([A-Z]\)/ \1/g' | sed 's/^ *//;s/ *$//'`

Can someone help with a sed command that does what I am asking? Thanks.

[nezachem]

In the ChanNameVAlign case you want to split at the transition from lowercase to uppercase:
s/\([a-z]\)\([A-Z]\)/\1 \2/g

In the OSDSettings, I don't see a non-contradictory criteria.

[iamthesgt]

Thanks. I will try that, but the current regex does split OSDSettings into O S D Settings

[iamthesgt]

Okay, I thought of something to try, but I can't seem to construct the regex. If I have a string of the format "O S D Settings" that I want to convert to "OSD Settings", I could just concatenate the capital letters that are followed by a space, right? How might I construct this Regex?

[iamthesgt]

This is working part way:

sed 's/ \([A-Z]\) \([A-Za-z]*\)/\1/g'

However, when run on the string "O S D Settings", it returns "OS Settings" - it is only operating on the first instance of the regex. Any tips on how to make it work for the whole line?

[nezachem]

concatenate the capital letters that are followed by a space

I can think only of a 3-step solution (which looks ugly, but possibly it can be improved):
- replace all wanted spaces with, say, underscores:
s/ \([A-Z][^ ]\)/_\1/g'
- remove all remaining spaces:
s/ //g
- restore wanted spaces:
s/_/ /g'

Something like that...

[iamthesgt]

Well, you don't have to use three commands - you can use pipes to redirect the code:

echo $string | sed 's/ \([A-Z][^ ]\)/_\1/g' | sed 's/ //g' | sed 's/_/ /g'

Anyway, thanks. This works. Thanks for all the help.