Question

I am trying to make an if statement that will test a string in jQuery (or Javascript). Here are the conditions:

1. Has to be between 6-8 characters.
2. First character cannot be a number.
3. Has to contain 1 number, 1 lowercase letter, and 1 uppercase letter.

Here is my regex code:

((?=^[^0-9])(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,8})

I tested it on a website that tests regex codes, and it works fine.

Here is my if statement currently:

if(((?=^[^0-9])(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,8}).test(strOldPassword))
{
    alert("Something");
}

I am getting a syntax error when my webpage loads however, saying that there is a problem with the regex.

Can someone help me find what I am doing wrong? Thanks.

Answer 1

There are two ways to define a regular expression in JavaScript.

1. Using the /.../ syntax.

   /((?=^[^0-9])(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,8})/
   

2. By creating an instance of RegExp object which accepts the regular expression as a String in the constructor.

   new RegExp("((?=^[^0-9])(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,8})")
   

That is,

if(/((?=^[^0-9])(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,8})/.test(strOldPassword)){
  alert("Something");
}