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Test whether an SGML attribute value requires quoting

SGML attribute values don't always need to be quoted; here's a quick bit of Python which returns whether an attribute value needs to be quoted or not:

import re
if re.compile('^[a-zA-Z0-9_\-\.:]+$').search(value):
   ...does not need quoting..
else:
   ...does need quoting...
to regex python sgml attribute quotes by ubernostrum on Apr 21, 2006
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