CODEWITHSUNDEEP
c#.netregex
mikeathers
mikeathers

Reputation: 43

Regular expression not working (cannot convert string to int (Regex.IsMatch)

There is a really simple answer to this, I know there is. But I cannot get my head around it. Its a console application you enter a word "password" and it will tell me whether it matches my regular expression, as you can properly gather.

Basically I want to know why this wont work:

static void Main(string[] args)
{
    Regex regularExpression = new Regex("/^[a-z0-9_-]{3,16}$/");

    Console.Write("Enter password: ");
    string password = Console.ReadLine();

    if (Regex.IsMatch(password, regularExpression))
        Console.WriteLine("Input matches regular expression");
    else
        Console.WriteLine("Input DOES NOT match regular expression");

    Console.ReadKey(); 
}

I'm sure it's something to do with the Regex.IsMatch method not being able to convert string to int.

Upvotes: 0

Views: 1698

Answers (2)

stema
stema

Reputation: 93026

Because you are using the static method isMatch and are giving a regex object, where it expects a regex as string, see the Regex class.

And additionally you don't need regex delimiters in .net.

Use this:

static void Main(string[] args) {
    Regex regularExpression = new Regex(@"^[a-z0-9_-]{3,16}$");

    Console.Write("Enter password: ");
    string password = Console.ReadLine();

    if (regularExpression.IsMatch(password))
        Console.WriteLine("Input matches regular expression");
    else
        Console.WriteLine("Input DOES NOT match regular expression");
    Console.ReadKey(); 
}

Upvotes: 2

burning_LEGION
burning_LEGION

Reputation: 13450

Regex regularExpression = new Regex("/^[a-z0-9_-]{3,16}$/");

/ is symbol, replace them to string empty => @"^[a-z0-9_-]{3,16}$"

Upvotes: 0

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