I've been yanking clumps of hair out for 30 minutes doing this one...

I have a dictionary, like so:

{'search': 'replace','foo':    'bar'}

And a string like this:

Foo bar %foo% % search %.

I'd like to replace each variable with it's equivalent text from the dictionary:

Foo bar bar replace.

My current regex fails, so here it is (key and value are from dictionary.items()):

 re.sub(r'%\d+' + key + '[^%]\d+%', value, text)

Any help would be appreciated, as this regex stuff is driving me nuts...

If you're flexible with your syntax in your string, Python has a built in mechanism for that:

>>> print 'Hello, %(your_name)s, my name is %(my_name)s' % {'your_name': 'Blender', 'my_name': 'Ken'}
Hello, Blender, my name is Ken

Alternatively, if you want that syntax, I'd avoid regular expressions and just do this:

>>> vars = {'search': 'replace',
...  'foo':    'bar'}
>>> mystring = "Foo bar %foo% % search %."
>>> for k, v in vars.items():
...     mystring = mystring.replace('%%%s%%' % k, v)
... 
>>> print mystring
Foo bar bar % search %.