Hi, i checked it manually and i made the note below when i was checking.
I confirm that you didn't remove any test that was not a duplicate, but i am not sure if there's any duplicate left.

91 - 606
276 - 75
277 - 76
278 - 77
116 to 125 - 282 to 291
126 to 128 - 293 to 295
129 - 297
130 - 302
131 - 303
132 - 305
133 - 306
134 to 138 - 308 to 312
141 to 150 - 315 to 324
154 - 327
155 - 328
159 - 329
160 - 330
162 to 167 - 331 to 336
187 to 189- 337 to 339

190 - 342
156 - 343
191 to 194 - 344 to 347
157 to 158 - 348 to 349
195 to 197 - 350 to 352
198 - 356
199 - 358
200 - 360
201 to 204 - 362 to 365
205 to 211 - 368 to 374

213 to 230 - 376 to 393
231 to 239 - 401 to 409

240 - 549
105 - 591
109 - 592

and i found a special test case:
212 ('^(ab|cd)e', 'abcde', FAIL, 'xg1y', 'xy'),
375 ('^(ab|cd)e', 'abcde', FAIL),

According to the comment in re_test.py(line 41), the 'xg1y' and 'xy' means:
3: a string that will be eval()'ed to produce a test string.
This is an arbitrary Python expression; the available
variables are "found" (the whole match), and "g1", "g2", ...
up to "g99" contain the contents of each group, or the
string 'None' if the group wasn't given a value, or the
string 'Error' if the group index was out of range;
also "groups", the return value of m.group() (a tuple).
4: The expected result of evaluating the expression.
If the two don't match, an error is reported.

But i counld not figure out how it work with a 'xg1y' becasue the other test cases' 3th elements are just like 'found' or 'found+"-"+g1+"-"+g2'.

I hope the work i do helps.