Dale Amon wrote:
> This finds nothing:
>
> import re
> import string
> card = "abcdef"
> DEC029 = re.compile("[^&0-9A-Z/ $*,.\-:#@'=\"[<(+\^!);\\\]%_>?]")
> errs = DEC029.findall(card.strip("\n\r"))
> print errs
>
> This works correctly:
>
> import re
> import string
> card = "abcdef"
> DEC029 = re.compile("[^&0-9A-Z/ $*,.\-:#@'=\"[<(+\^!)\\;\]%_>?]")
> errs = DEC029.findall(card.strip("\n\r"))
> print errs
>
> They differ only in the positioning of the quoted backslash.
>
> Just in case it is of interest to anyone.
You have to escape twice; once for Python and once for the regular
expression. Or use raw strings, denoted by an r"..." prefix:
>>> re.findall("[^&0-9A-Z/ $*,.\-:#@'=\"[<(+\^!);\\\]%_>?]", "abc")
[]
>>> re.findall("[^&0-9A-Z/ $*,.\-:#@'=\"[<(+\^!);\\\\\\]%_>?]", "abc")
['a', 'b', 'c']
>>> re.findall(r"[^&0-9A-Z/ $*,.\-:#@'=\"[<(+\^!);\\\]%_>?]", "abc")
['a', 'b', 'c']
Peter
--
http://mail.python.org/mailman/listinfo/python-list
