On 4/25/2014 12:30 PM, Robin Becker wrote:
Whilst translating some javascript code I find that this
A=re.compile('.{1,+3}').findall(p)
doesn't give any error, but doesn't manage to find the strings in p that
I want len(A)==>0, the correct translation should have been
A=re.compile('.{1,3}').findall(p)
which works fine.
should
re.compile('.{1,+3}')
raise an error? It doesn't on python 2.7 or 3.3.
And it should not because it is not an error. '+' means 'match 1 or more
occurrences of the preceding re' and the preceding re is ','.
>>> re.match('a{1,+3}', 'a{1,,,3}').group()
'a{1,,,3}'
I suppose that one could argue that '{' alone should be treated as
special immediately, and not just when a matching '}' is found, and
should disable other special meanings. I wonder what JS does if there is
no matching '}'?
--
Terry Jan Reedy
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