CODEWITHSUNDEEP
c#regex
Rin
Rin

Reputation: 81

C# Regex for all chars and '-'

I've been trying all combinations that I could find on google, but nothing seems to allow me the regex for all letters and only one special charachter..

Example of what Im trying to achieve:

Something-something (accepted)

something something (accepted)

-Something(not accepted)

SomethingSomething-(not accepted)

something-something-somthing(accepted)

So as you see, I need to be able to use all letters and special char - anywhere inbetween letters. Hopefully someone knows the answer on how to achieve this.

My code:

private void textBox8_TextChanged(object sender, EventArgs e)
{
    if (string.IsNullOrWhiteSpace(textBox8.Text) || !Regex.IsMatch(textBox8.Text, @"^[A-Za-z]\-+$"))
    {
        textBox8.BackColor = Color.Red;         
    }
    else
    {
        textBox8.BackColor = Color.White;           
    }
}

Upvotes: 1

Views: 117

Answers (5)

rock321987
rock321987

Reputation: 11032

You can use this regex

^[A-Za-z]+(?:[- ][A-Za-z]+)*$

Check here

Regex Breakdown

^ #Start of string
[A-Za-z]+ #Match alphabets
(?:[- ][A-Za-z]+)* #Match - followed by alphabets 0 or more times
$ #End of string

Upvotes: 1

jdweng
jdweng

Reputation: 34421

Try this. You didn't specify if the dash was required or not required. I assume the dash was optional. 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] inputs = {
                "Something-something", 
                "-Something",
                "SomethingSomething-",
                "something-something-somthing",
                "1234"
            };

            string pattern = @"^([A-Za-z]+[-\s]?[A-Za-z]+)+$";

            foreach (string input in inputs)
            {
                Console.WriteLine("Input : '{0}', Match : '{1}'", input, Regex.IsMatch(input, pattern) ? "Yes" : "No");
            }
            Console.ReadLine();
        }


    }

}

Upvotes: 0

Sreemat
Sreemat

Reputation: 626

Try this Regex

^[^-]([a-zA-z-]*)[^-]$

Upvotes: 0

Kirhgoph
Kirhgoph

Reputation: 415

If you need letters before and after the hyphen:

[A-Za-z]+\-[A-Za-z]+

If you just need a hyphen and letters somewhere in the string

[A-Za-z]?\-[A-Za-z]?

Upvotes: 1

adjan
adjan

Reputation: 13652

Does this pattern work for you?

^([A-Za-z]+-)+[A-Za-z]+$

Matches

Something-Something
Something-Something-Something
S-o-m-e-t-h-i-n-g

Does not match

-Something
Something-
Something-Something-
Something

Upvotes: 0

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