Peng Yu wrote:
I would like to match "a::" in "a::b", but not in "a:: b". That is, the character after "::" should be a alphanumeric character.
sounds like a look-ahead assertion is what you need:
>>> import re
>>> re.match("\w::(?=\w)", "a::b")
<_sre.SRE_Match object at 0x01442138>
>>> _.group()
'a::'
>>> re.match("\w::(?=\w)", "a:: b")
>>>
</F>
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