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I have a string in which I want to contract double spaces to single spaces.

I was trying this:

No success. So I tried

Still the same.
I tried

and still no success.

Then I tried

and it worked right away. So what's wrong with those spaces? How do I have to do it?

Most of those examples should work okay. For example, I tested the following and it produces the right answer:

However, the above will not work completely if you have any triple-spaces, quad-spaces, etc. In that case, you could try the following:

Actually, that's about the same lines I had to replace multiple spaces. Seeing you using those as well I concluded that the error must be elsewhere. A hex viewer finally revealed that there were no multiple spaces but multiple tabs! But they sure looked like spaces!