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In the case of this particular search, you could write your
own little searcher.  The following could likely be done
better, but this is a quick 5-minute job that won't core on
you unless something is really wrong with Python, and may be
a reasonable stopgap until someone re-does the regular
expression library.

import string

def find_thing(s):
    sp = 0
    d = dict.fromkeys(list(string.letters+string.digits+'_'))
    while sp < len(s):
        start = None
        for i in xrange(sp, len(s)):
            if s[i] == '[':
                start = i
                break
        if start is None:
            return
        for i in xrange(start+1, len(s)):
            if s[i] in d:
                continue
            elif s[i] == ']':
                return s[start:i+1]
            else:
                sp = i
                break

It returns None on failure to find, and the string otherwise.