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I'm trying to match a string like 'r"abc"' or '"abc"' I thought I would do '[r|.]"[\w]+"'

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Use ? to mean optional.

'r?"\\w+"'

Example usage:

>>> re.match('r?"\\w+"', 'r"abc"') <_sre.SRE_Match object at 0x0000000002A57440> >>> re.match('r?"\\w+"', '"abc"') <_sre.SRE_Match object at 0x00000000029FDAC0>
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'r?"\w+"'

should do, you match r prefix optionally. Also square brackets around a \w are not needed: it's a single character!

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