How to make text roll over into another textbox? Visual Basic - textbox

So, I want to make it so that, when the user pastes something into a textbox, once it pastes the first 24 characters into that textbox, it will send the rest to a richtextbox.
I've tried splitting, joining, with no luck. I don't know what else I can do. Any ideas?
I've tried:
If TextBox1.Text > TextBox1.MaxLength Then
RichTextBox4.Text = TextBox1.Text
End If
And some other weird things that didn't work out. I would appreciate some help.
Thank you.

use Substring....
Dim input = textbox1.text
Dim substring As String = input .Substring(0, 24)
richtextbox4.text = substring
http://www.dotnetperls.com/substring-vbnet

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I tried doing it using the StringReplace() but i noticed it only returns the number of replacements and didnt actually returned the updated string:
string v5="- .82523";
string temp2 = v5;
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You are using the StringReplace() function incorrectly. Try the following code (from your example).
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I am making a script inside TextButton script that will check if the TextBox contains any of the word or string inside the table.
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Oh boy, there's a lot to say about this.
The error message
Yes.
No, seriously, the answer is yes. The error message is exactly right. a is a table value; you can clearly see that on the third line of code. string.match needs a string as its second argument, so it obviously crashes.
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for index, entry in ipairs(a) do
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The better* solution
In Lua, if we want to know if a single element is in a set, we usually take advantage of the fact that tables are implemented as hashmaps, meaning they are very fast when looking up keys.
For that to work, one first needs to change the way the table looks:
a = {["test1"] = true, ["test2"] = true, ["test3"] = true}
Then we can just index a with a string to find out if it is contained int eh set.
if a[text.Text] then ...
* In practice this is just as good as the first solution as long as you only have a few elements in your table. It only becomes relevant when you have a few hundred entries or your code needs to run absolutely as fast as possible.

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The variables are defined as:
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$messagebody = 'START:'.$messagebody;
do what you need to do
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I want to get two separate value from
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