TexPad is creating it. I know that it is under some deadkey. I just cannot remember it is name.
The blue character:
I just want to mass remove them from my document.
How can you type it?
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It is known as carriage return.
If you're using
vim you can enter insert mode and type CTRL-v CTRL-m. That ^M is the keyboard equivalent to \r.
0x0D in a hex editor will do the task.
How do I remove it?
You can remove it using the command
perl -p -i -e "s/\r//g" filename
As the OP suggested in the comments of this answer here, you can even try a `
and see if that fixes it.
As @steeldriver suggests in the comments, after opening the vim editor, press esc key and type