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Alex Rivera
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I first saw it used in building regular expressions across multiple lines as a method argument to re.compile() , so I assumed that r stands for RegEx. For example: regex = re.compile( r'^[A-Z]' r'[A-Z0-9-]' r'[A-Z]$', re.IGNORECASE ) So what does r mean in this case? Why do we need it?
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