[Tutor] redemo.py and r'python\.org'

[Kent Johnson]

Dick Moores wrote:
> I've begun to try out redemo.py to test and learn regular expressions. It 
> doesn't seem to accept Python's raw strings as raw strings, e.g., 
> r'python\.org'  for matching  python.org  and nothing else. Am I correct, 
> or is there something I don't understand here?

In redemo you just type the actual regex string, no quotes or r prefix. So if you type into the top text box
  python\.org
and in the middle text box
  python.org
then you will get a match.

In your program then you have to type the regex as a string literal so you would type
  r'python\.org'

> 
> BTW redemo.py can be found in Python 2.4 in Tools\Scripts.
> 
> BTW2 The new book, _Beginning Python: From Novice to Professional_, by 
> Magnus Lie Hetland, has 16 pages on the re module, pp. 235-251.
> 
> (A question about quoting in a Tutor post: in my 1st paragraph above, how 
> could I have indicated that I am quoting both
> 
> r'python\.org'   and     python.org
> 
> without using quotation marks to do so, so as to not confuse the regex? I 
> think I remember someone recently using angled brackets. So how about 
> <r'python\.org'> and <python.org>?  Is there a convention about this?)

I found it clear the way you typed it. In my response I set the strings off with newlines and an indent. Angle brackets would probably work fine too. IOW I don't think there is really a convention.

Kent
> 
> 
> Thanks,
> 
> Dick Moores
> 
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