Joe Strout wrote: > Catching up on what's new in Python since I last used it a decade ago, > I've just been reading up on template strings. These are pretty > cool!
I don't think they've gained much traction and expect them to be superseded by PEP 3101 (see http://www.python.org/dev/peps/pep-3101/ ) > However, just as a template string has some advantages over % > substitution for building a string, it seems like it would have > advantages over manually constructing a regex for string matching. > > So... is there any way to use a template string for matching? I > expected something like: > > templ = Template("The $object in $location falls mainly in the > $subloc.") > d = templ.match(s) > > and then d would either by None (if s doesn't match), or a dictionary > with values for 'object', 'location', and 'subloc'. > > But I couldn't find anything like that in the docs. Am I overlooking > something? I don't think so. Here's a DIY implementation: import re def _replace(match): word = match.group(2) if word == "$": return "[$]" return "(?P<%s>.*)" % word def extract(template, text): r = re.compile(r"([$]([$]|\w+))") r = r.sub(_replace, template) return re.compile(r).match(text).groupdict() print extract("My $$ is on the $object in $location...", "My $ is on the biggest bird in the highest tree...") As always with regular expressions I may be missing some corner cases... Peter -- http://mail.python.org/mailman/listinfo/python-list
