Password must have at least one non-alpha character

Question

I need a regular expression for a password  The password has to contain at least 8 characters  At least one character must be a number or a special character  not a letter     StringLength 100  ErrorMessage    The  0  must be at least  2  characters long    MinimumLength   8    RegularExpression         W        d    ErrorMessage    Error message     DataType DataType Password    Display Name    Password    public string Password   get  set      I have a length validation  but I need help with a regular expression that checks if the password contains at least one number or special character   Examples of valid passwords   testtest85  testtes  testtes1 test1234     Examples of not valid passwords   testtest testabc

User · Accepted Answer

Use regex pattern       8         a-zA-Z      Explanation         8         a-zA-Z      ------  -------------                                           string contains some non-letter character                string contains at least 8 characters      begining of line string     If you want to limit also maximum length  let s say 16   then use regex pattern          8 16          a-zA-Z

User · Answer

I tried Omega s example however it was not working with my C  code  I recommend using this instead    RegularExpression          d      d  w  w          7 20    ErrorMessage     Error  Password must have one capital  one special character and one numerical character  It can not start with a special character or a digit

User · Answer

A simple method will be like this   Match match1   Regex Match  lt input string gt          7           match1 Success ensures that there are at least 8 characters   Match match2   Regex Match  lt input string gt     a-zA-Z      match2 Success ensures that there is at least one special character or number within the string   So  match1 Success  amp  amp  match2 Success guarantees will get what you want

User · Answer

function randomPassword length            var chars    abcdefghijklmnopqrstuvwxyz   ABCDEFGHIJKLMNOP1234567890           var pass               for  var x   0  x  lt  length  x                  var i   Math floor Math random     chars length               pass    chars charAt i                     var pattern   false          var passwordpattern   new RegExp    a-zA-Z0-9    0-9    A-Z    a-z              pattern   passwordpattern test pass           if  pattern    true                alert pass             else            randomPassword length             try this to create the random password with atleast one special character

User · Answer

An expression like this    a-zA-Z   0-9      a-zA-Z0-9         should work just fine  obviously insert any additional special characters you want to allow or use   operator to match anything except letters numbers   no need to use complicated lookarounds  This approach makes sense if you only want to allow a certain subset of special characters that you know are  safe   and disallow all others   If you want to include all special characters except certain ones which you know are  unsafe   then it makes sense to use something like    w        a-zA-Z            In this case  you are explicitly disallowing backslashes in your password and allowing any combination with at least one non-alphabetic character otherwise   The expression above will match any string containing letters and at least one number or      As for the  length of 8  requirement  theres really no reason to check that using regex

User · Answer

Run it through a fairly simple regex    a-zA-Z   And then check it s length separately   if string Length  gt  7

[c#] Password must have at least one non-alpha character

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