String.Length

Description

Gets the number of characters in this instance (Read Only).

Returns the number of characters in the string. This is read-only.

using UnityEngine;

public class Example : MonoBehaviour
{
    string m_MyString;
    // Use this for initialization
    void Start()
    {
        //Set the string to this message
        m_MyString = "Hi there!";
        //Output the number of characters in the string
        Debug.Log("Length : " + m_MyString.Length);
    }
}

The next example allows you to type in a password and check if the password is less than 8 characters using String.Length.

//Create an Input Field ( Create>UI>Input Field) and a Text GameObject (Create>UI>Text).
//Attach this script to a GameObject
//Click on the GameObject and attach each of the Sliders and Texts to the fields in the Inspector.

using UnityEngine;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
    string m_MyString;

    public InputField m_MyInputField;
    public Button m_MyButton;

    void Start()
    {
        //Call SubmitPasswordButton function when the user clicks the Button
        m_MyButton.onClick.AddListener(SubmitPasswordButton);
    }

    void Update()
    {
        //Set the string to be that of the InputField
        m_MyString = m_MyInputField.text;
    }

    //Check the length of the string and output a message to the console window
    void SubmitPasswordButton()
    {
        //Check if length of the string is less than 8
        if (m_MyString.Length < 8)
        {
            Debug.Log("Password not long enough!");
        }
        //Check if the length of the string is more than or equal to 8
        if (m_MyString.Length >= 8)
        {
            Debug.Log("Password Accepted!");
        }
    }
}