Specific password regular expression

Question

I am having problems creating a regular expresion. It needs to fullfill the following:

1) Has 8-12 characters

2) At least 1 uppercase letter

3) At least 3 lowercase letters

4) At least 1 number

5) At least 1 special character

6) Has to start with a lowercase, upercase or numeric

7) Maximum of 2 repeating characters

Thanks in advance!

Answer 1

This should work

^(?=.*[A-Z])(?=(?:.*[a-z]){3})(?=.*[0-9])(?=.*[!"#$%&'()*+,\-./:;<=>?@[\]^_`{|}~])(?=(?:(.)(?!\1\1))+$)[a-zA-Z0-9].{7,11}$

Explained / Expanded

 ^                             # BOS
 (?= .* [A-Z] )                # 1 upper
 (?=
      (?: .* [a-z] ){3}             # 3 lower
 )
 (?= .* [0-9] )                # 1 number
 (?=
      .* [!"#$%&'()*+,\-./:;<=>?@[\]^_`{|}~]   # 1 special
 )
 (?=                           # Maximum 2 repeating
      (?:
           ( . )                         # (1)
           (?! \1 \1 )
      )+
      $ 
 )
 [a-zA-Z0-9]                   # First alnum
 .{7,11}                       # 8 to 12 max chars
 $                             # EOS