> On Tue, Dec 27, 2011 at 10:45 AM, mauricel...@acm.org > <mauricel...@gmail.com> wrote: >> Hi >> >> I am trying to change <one string> to <another string>. >> >> Can anyone help me with the regular expressions needed? > > A regular expression defines a string based on rules. Without seeing a > lot more strings, we can't know what possibilities there are for each > part of the string. You probably know your data better than we ever > will, even eyeballing the entire set of strings; just write down, in > order, what the pieces ought to be - for instance, the first token > might be a literal @ sign, followed by three upper-case letters, then > a hyphen, then any number of alphanumerics followed by a colon, etc. > Once you have that, it's fairly straightforward to translate that into > regex syntax. > > ChrisA > -- > http://mail.python.org/mailman/listinfo/python-list
The OP told me, off list, that my guess was true: > Can we say that your string: > 1) Contains 7 colon-delimited fields, followed by > 2) whitespace, followed by > 3) 3 colon-delimited fields (A, B, C), followed by > 4) a colon? > The transformation needed is that the whitespace is replaced by a > slash, the "A" characters are taken as is, and the colons and fields > following the "A" characters are eliminated? Doubtful that my guess was 100% accurate, but nevertheless: >>> import re >>> string1 = "@HWI-ST115:568:B08LLABXX:1:1105:6465:151103 1:N:0:" >>> re.sub(r"(\S+)\s+(\S+?):.+", "\g<1>/\g<2>", string1) '@HWI-ST115:568:B08LLABXX:1:1105:6465:151103/1' -- http://mail.python.org/mailman/listinfo/python-list
