"Joseph T. Tannenbaum" wrote:
> 
> Hello,
> 
> I am going through Mastering Regular Expressions by Jeffrey Friedl (O'Reilly
> book)
> and I got to a snippet of using a regular expression in python.  I am using
> python
> 1.5.2 for win98, and this prog doen't work correctly. (it is supposed to
> point out
> double words in a text file ei "the the world."  The main part I am in doubt
> about
> is setting up 'data' prior to printing.  Is this format correct?  It is on
> pg 57 of
> the book, and the reg3 line is correct by the errata.
> 
> Thanks
> Joe
> 
> Here is the snippet:
> 
> import sys; import regex; import regsub
> 
> ### Prepare the three regeses w'll use
> reg1 = regex.compile(
>                         '\\b\([a-z]+\)\(\([\n\r\t\f\v ]\|<[^>]+>\)+\)\(\\1\\b\)',
>                         regex.casefold)
> reg2 = regex.compile('^\([^033]*\n\)+')
                            ^\033
This my be just a post typo, but...

> reg3 = regex.compile('^\(.\)')
> 
> for filename in sys.argv[1:]:                           # for each file...
>         try:
>                 file = open(filename)                           # try opening file
>         except IOError, info:
>                 print '%s: %s' % (filename, info[1])    # report error if couldn't
>                 continue                                                                                        # and also abort this iteration.
> 
>         data = file.read()                                                              # Slurp the whole file to 'data', apply regexes
> and print
>         data = regsub.gsub(reg1, '\033[7m\\1\033[m\2\033[7m\\4\033[m', data)
                                        ^^^       ^^^     ^^^       ^^^
                       Please excuse ignorance, but what are these?

>         data = regsub.gsub(reg2, '', data)
>         data = regsub.gsub(reg3, filename + ':  \\1', data)
>         print data,
                    ^
  I guess this just depends on what's next?

Note: Don't really know jack diddly bout Python. Just attracted by the smell
of regexs.

Saaalute!!
MD
> 
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