On Dec 18, 1:41 pm, tomasz <[EMAIL PROTECTED]> wrote: > Hi, > > here is a piece of pseudo-code (taken from Ruby) that illustrates the > problem I'd like to solve in Python: > > str = 'abc' > if str =~ /(b)/ # Check if str matches a pattern > str = $` + $1 # Perform some action > elsif str =~ /(a)/ # Check another pattern > str = $1 + $' # Perform some other action > elsif str =~ /(c)/ > str = $1 > end > > The task is to check a string against a number of different patterns > (containing groupings). > For each pattern, different actions need to be taken. >
In the `re.sub` function (and `sub` method of regex object), the `repl` parameter can be a callback function as well as a string: http://docs.python.org/lib/node46.html Does that help? Eg. def multireplace(text, mapping): rx = re.compile('|'.join(re.escape(key) for key in mapping)) def callback(match): key = match.group(0) repl = mapping[key] log.info("Replacing '%s' with '%s'", key, repl) return repl return rx.subn(callback, text) (I'm not sure, but I think I adapted this from: http://effbot.org/zone/python-replace.htm) Gerard -- http://mail.python.org/mailman/listinfo/python-list
