"Steve" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hi All, > > I'm having a tough time converting the following regex.compile patterns > into the new re.compile format. There is also a differences in the > regsub.sub() vs. re.sub() > > Could anyone lend a hand? > >
Not an re solution, but pyparsing makes for an easy-to-follow program. TransformString only needs to scan through the string once - the "reals-before-ints" testing is factored into the definition of the formatters variable. Pyparsing's project wiki is at http://pyparsing.wikispaces.com. -- Paul ------------------- from pyparsing import * """ read Perl-style formatting placeholders and replace with proper Python %x string interp formatters ###### -> %6d ##.### -> %6.3f <<<<< -> %-5s >>>>> -> %5s """ # set up patterns to be matched - Word objects match character groups # made up of characters in the Word constructor; Combine forces # elements to be adjacent with no intervening whitespace # (note use of results name in realFormat, for easy access to # decimal places substring) intFormat = Word("#") realFormat = Combine(Word("#")+"."+ Word("#").setResultsName("decPlaces")) leftString = Word("<") rightString = Word(">") # define parse actions for each - the matched tokens are the third # arg to parse actions; parse actions will replace the incoming tokens with # value returned from the parse action intFormat.setParseAction( lambda s,l,toks: "%%%dd" % len(toks[0]) ) realFormat.setParseAction( lambda s,l,toks: "%%%d.%df" % (len(toks[0]),len(toks.decPlaces)) ) leftString.setParseAction( lambda s,l,toks: "%%-%ds" % len(toks[0]) ) rightString.setParseAction( lambda s,l,toks: "%%%ds" % len(toks[0]) ) # collect all formatters into a single "grammar" # - note reals are checked before ints formatters = rightString | leftString | realFormat | intFormat # set up our test string, and use transform string to invoke parse actions # on any matched tokens testString = """ This is a string with ints: #### # ############### floats: #####.# ###.###### #.# left-justified strings: <<<<<<<< << < right-justified strings: >>>>>>>>>> >> > int at end of sentence: ####. """ print formatters.transformString( testString ) ------------------- Prints: This is a string with ints: %4d %1d %15d floats: %7.1f %10.6f %3.1f left-justified strings: %-8s %-2s %-1s right-justified strings: %10s %2s %1s int at end of sentence: %4d. -- http://mail.python.org/mailman/listinfo/python-list
