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- import re
- componentRegex = re.compile(r"^[a-z][a-z0-9_]*$")
- def checkURI(uri):
- """
- uri: lowercase, dot separated string.
- throws exception if invalid.
- returns: uri
- """
- components = uri.split(".")
- for component in components:
- match = componentRegex.match(component)
- if not match:
- raise Exception("invalid URI")
- return uri
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