The below seems to pass all the tests you threw at it (taking the
modified 2nd test into consideration)
One other test that occurs to me would be
"xyz123aaabbaaabab"
where you have "aaab" in there twice.
-tkc
import re
tests = [
("xyz123aaabbab",True),
("xyz123aabbaaab", False),
("xayz123aaabab",True),
("xaaayz123abab", False),
("xaaayz123aaabab",True)
]
exp = '^([^b]|((?<!a)b))*aaab+[ab]*$'
r = re.compile(exp)
print "Using regexp: %s" % exp
for test,expectedResult in tests:
if r.match(test):
result = True
else:
result = False
if result == expectedResult:
print "%s passed" % test
else:
print "%s failed (expected %s, got %s)" % (
test,expectedResult,result)
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