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    <p>I think this is a difficult question to specify in a precise way, but perhaps this strategy will approximate your goal.</p> <p>The basic idea is to create a copy of the original string, removing the <strong>internally quoted items</strong>. An internally quoted item is defined here so that it must contains at least one non-whitespace character.</p> <p>After the internally quoted items have been removed, you then check whether the entire string needs surrounding quotes or not.</p> <pre><code>import re tests = [ # Test data in original question. ( '', '""' ), ( 'a', '"a"' ), ( '"a"', '"a"' ), # No change. ( '""a" b"', '""a" b"' ), # No change. ( '"a" b', '""a" b"' ), ( '"a" "b"', '""a" "b""' ), ( 'a "b" c', '"a "b" c"' ), # Test data in latest edits. ( 'type', '"type"' ), # Quote these. ( '"type" /?', '""type" /?"' ), ( '"type" "/?"', '""type" "/?""' ), ( 'type "a a" b', '"type "a a" b"' ), ( 'type "" b', '"type "" b"' ), ( '"type"', '"type"' ), # Don't quote. ( '""type" /?"', '""type" /?"' ), # Some more tests. ( '"a b" "c d"', '""a b" "c d""' ), ( '" a " foo " b "', '"" a " foo " b ""' ), ] Q = '"' re_quoted_items = re.compile(r'" \s* [^"\s] [^"]* \"', re.VERBOSE) for orig, expected in tests: # The orig string w/o the internally quoted items. woqi = re_quoted_items.sub('', orig) if len(orig) == 0: orig_quoted = Q + orig + Q elif len(woqi) &gt; 0 and not (woqi[0] == Q and woqi[-1] == Q): orig_quoted = Q + orig + Q else: orig_quoted = orig print orig_quoted == expected </code></pre>
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