I am building a user registration form using C# with .NET. I have a requirement to validate user entered password fields. Validation requirement is as below.
stack1over
)I am using a regular expression as below.
^([a-zA-Z0-9]{6,10})$
It satisfies my first 2 conditions. It fails when I enter only characters or numbers.
Pass it through multiple regexes if you can. It'll be a lot cleaner than those look-ahead monstrosities :-)
^[a-zA-Z0-9]{6,10}$
[a-zA-Z]
[0-9]
Though some might consider it clever, it's not necessary to do everything with a single regex (or even with any regex, sometimes - just witness the people who want a regex to detect numbers between 75 and 4093).
Would you rather see some nice clean code like:
if not checkRegex(str,"^[0-9]+$")
return false
val = string_to_int(str);
return (val >= 75) and (val <= 4093)
or something like:
return checkRegex(str,"^7[5-9]$|^[89][0-9]$|^[1-9][0-9][0-9]$|^[1-3][0-9][0-9][0-9]$|^40[0-8][0-9]$|^409[0-3]$")
I know which one I'd prefer to maintain :-)