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I need a regex that matches a string containing 6 alpha, 2 alphanumeric and 3 OPTIONAL alphanumeric, upper and lower case. I need this for validating strings in ASP.net 2. Eg:. abcdefab345 abcdef22 abcdef5e abcdef3ee5e abcdef55asd abcdefr5 and should not match abcs abcd34d3 abcdef23f abcdefd abcdef  

Hi, I have a validation criteria which says: a number cannot start with "000" which is 9 digits in length. And it needs to be in one expression. Can somebody help me in writing a regular expression for this? Thank you