I am trying to validate a password with the following rules:
So far I wrote this code:
[0-9a-zA-Z] (?=(.*\d){2}) {8,}
Im not sure why the passwords I enter returns invalid although it follows the rules.
Remember that spaces are meaningful in a regex pattern, so you require at least 8 spaces at the end. There are no anchors in the regex, so the length limitation might not work even if you write a correct pattern. So far, this will match an alphanumeric, a space that is followed with 2 occurrences of any 0+ chars followed with a digit, but since there is space with {8,} quantifier, this pattern will never match anything.
You need
^(?=.{8})[a-zA-Z]*(?:\d[a-zA-Z]*){2}[a-zA-Z0-9]*$
See the regex demo
^ - start of string(?=.{8}) - at least 8 chars[a-zA-Z]* - zero or more letters(?:\d[a-zA-Z]*){2} - 2 sequences of:
\d - a digit (may be replaced with [0-9])[a-zA-Z]* - zero or more letters[a-zA-Z0-9]* - 0+ alphanumeric chars$ - end of string.Alternatively, you may use
^(?=(?:[a-zA-Z]*\d){2})[a-zA-Z0-9]{8,}$
Here, (?=(?:[a-zA-Z]*\d){2}) will require at least 2 occurrences of 0+ letters followed with a digit in the string and [a-zA-Z0-9]{8,} will match 8 or more alphanumeric chars.
