How do I create a regular expression of minimum 8, maximum 16, alphabetic, numbers and NO space?

Question

I am trying to check text with a regular expression in iOS, and below is my code. My regular expression is accepting one word or number which it should be minimum 8 and maximum 16 with numbers or alphabetic.

if (![self validate:txtPass.text regex:@"^[a-zA-Z0-9]+$"]){

   NSLOG(@"Check value");
}

What should I change in my regular expression?

Answer 1

^[a-zA-Z0-9]{8,16}$

You can specify the minimum/maximum gathered using {X,Y} as the boundaries.

Other examples:
^[a-zA-Z0-9]{8,}$ #8 or more characters
^[a-zA-Z0-9]{,16}$ #Less than or equal to 16 characters
^[a-zA-Z0-9]{8}$ #Exactly 8 characters

Regex cheatsheet

Answer 2

You just need to put bounds on, not the + (one or more) operator.

^[a-zA-Z0-9]{8,16}$

Answer 3

^[A-Za-z0-9]{8,16}$

Specify a min/max length for a part of an expression using {x,y}, where x is the minimum and y is the maximum.