Hello,
Here is you duplicate thread but i am not going to merge it because you have different question now. (as i can see your last post in this thread)
http://social.technet.microsoft.com/Forums/en-US/sharepointadmin/thread/85146319-0dfd-4fa9-bea5-3eed8f4c0140
For you issue, You first need to understand the FBA concept and it's configuration part then you can look for password complexity.
Just see belwo URL and match with your web application then you will know about membership provider (look at "PasswordFormat" tag):
http://www.codeproject.com/Articles/352841/How-to-Configure-Form-Based-Authentication-FBA-in
Hope it could help
Hemendra: "Yesterday is just a memory,Tomorrow we may never see"
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