What is the difference between these 2 pieces of code in a batch file?
set str=!str:%%20= !
and
set str=%str:%%20= %
What is the difference between % % and ! ! in a batch file?
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Finally, after hours I could find the explanation. According to this page How-to: Escape Characters, Delimiters and Quotes at the Windows command line in the paragraph "Escaping Percents" :