JAVASCRIPT

js password validation regex

/^            : Start
    (?=.{8,})        : Length
    (?=.*[a-zA-Z])   : Letters
    (?=.*d)         : Digits
    /^(?=.*[!#$%&?*^()~` "])$/ : 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,}$/

how can i validate a password without regex in js

function validate() {
  var p = document.getElementById('pass').value
  var errors = []

  //if (p.length < 8) {
  //  errors.push("Your password must be at least 8 characters")
  //}
  if (p.search(/[a-z]/) < 0) {
    errors.push("Your password must contain at least one lowercase letter.")
  }
  if (p.search(/[A-Z]/) < 0) {
    errors.push("Your password must contain at least one uppercase letter.")
  }
  if (p.search(/[0-9]/) < 0) {
    errors.push("Your password must contain at least one digit.")
  }
  if(p.search(/[!@#$\%^&*()\_+.,;:-]/) < 0) {
    errors.push("Your password must contain at least one special character.")
  }
    
  if (errors.length > 0) {
    document.getElementById("errors").innerHTML = errors.join("<br>")
    return false;
  }
  return true;
}

js password validation regex

const regexPass = /(?=.*[!#$%&?^*@~() "])(?=.{8,})/; 
//eight char or longer and must have a special character

js regex for password

for REACT INPUT TAG

var errorMessage:
"Password should be 8-20 characters and include at least 1 letter, 1 number and 1 special character!",
<input name= "password",
type= "password",
placeholder= "Password",
pattern="^(?=.*[0-9])(?=.*[a-zA-Z])(?=.*[!@#$%^&*])[a-zA-Z0-9!@#$%^&*]{8,20}$",
required/>