Javascript regular expression password validation having special characters

Question

I am trying to validate the password using regular expression  The password is getting updated if we have all the characters as alphabets  Where am i going wrong   is the regular expression right    function validatePassword         var newPassword   document getElementById  changePasswordForm   newPassword value      var minNumberofChars   6      var maxNumberofChars   16      var regularExpression       a-zA-Z0-9       amp    6 16         alert newPassword        if newPassword length  lt  minNumberofChars    newPassword length  gt  maxNumberofChars           return false            if  regularExpression test newPassword             alert  password should contain atleast one number and one special character            return false

User · Accepted Answer

Use positive lookahead assertions   var regularExpression           0-9               amp     a-zA-Z0-9       amp    6 16       Without it  your current regex only matches that you have 6 to 16 valid characters  it doesn t validate that it has at least a number  and at least a special character  That s what the lookahead above is for          0-9   - Assert a string has at least one number               amp     - Assert a string has at least one special character

User · Answer

Don t try and do too much in one step  Keep each rule separate       function validatePassword         var p   document getElementById  newPassword   value          errors           if  p length  lt  8            errors push  Your password must be at least 8 characters              if  p search   a-z  i   lt  0            errors push  Your password must contain at least one letter                if  p search   0-9     lt  0            errors push  Your password must contain at least one digit               if  errors length  gt  0            alert errors join   n             return false            return true

User · Answer

When you remake account password make shure it s 8-20 characters include numbers and special characters like      characters like this then verify new password and re enter exact same and should solve the issues with the password verification

User · Answer

you can make your own regular expression for javascript validation                      Start          8             Length           a-zA-Z       Letters           d            Digits                amp         Special characters                       End                              d                   should contain at least one digit               a-z                 should contain at least one lower case               A-Z                 should contain at least one upper case          a-zA-Z0-9  8             should contain at least 8 from the mentioned characters               Example -           d       a-zA-Z   a-zA-Z0-9  7

User · Answer

After a lot of research  I was able to come up with this  This has more special characters validatePassword password            const re          d       a-z        A-Z               amp      -           quot   lt  gt                8            return re test password

User · Answer

it s work perfect for me and i am sure will work for you guys checkout it easy and accurate var regix   new RegExp  quot        a-z        A-Z        0-9                 amp                        8    quot     if regix test password     false              messageBox   html   lt div class  quot messageStackError quot  gt         password must be a minimum of 8 characters including number  Upper  Lower And         one special character       lt  div gt       else              form   submit

User · Answer

If you check the length seperately  you can do the following   var regularExpression       a-zA-Z      if  regularExpression test newPassword         alert  password should contain atleast one number and one special character        return false

User · Answer

I use the following script for min 8 letter password  with at least a symbol  upper and lower case letters and a number  function checkPassword str        var re           d              amp          a-z        A-Z    8          return re test str

User · Answer

function validatePassword         var p   document getElementById  newPassword   value          errors           if  p length  lt  8            errors push  Your password must be at least 8 characters               if  p search   a-z  i   lt  0            errors push  Your password must contain at least one letter               if  p search   0-9     lt  0            errors push  Your password must contain at least one digit                if  errors length  gt  0            alert errors join   n             return false            return true      There is a certain issue in below answer as it is not checking whole string due to absence of     while checking the characters and numerals  this is correct version

User · Answer

Regex for password           d       A-Z        a-z        a-zA-Z     amp       a-zA-Z0-9     amp    8 20     Took me a while to figure out the restrictions  but I did it   Restrictions   Note  I have used    and  lt  lt  to show the important characters    Minimum 8 characters    gt  gt 8 20  Maximum 20 characters   8  gt  gt 20  At least one uppercase character        A-Z   At least one lowercase character        a-z   At least one digit        d  At least one special character        a-zA-Z  gt  gt      amp     lt  lt    a-zA-Z0-9  gt  gt      amp   lt  lt

[javascript] Javascript regular expression password validation having special characters

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