text validation for text box

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hi to all!

here i make to restrivt textbox for only alphabets and numbers

C#

Regex regex = new Regex("^[a-zA-Z0-9]*$");

but i want to add single space between them as well how to do
so that i can write string like this

asd sdf
ah klh ksd ldf lk
lk djfg jbp

but not like this lkdjfg djgldfjg
i mean to say only single space between them

Posted 26-Sep-11 19:45pm

kami124

Updated 26-Sep-11 19:52pm

Mehdi Gholam

v2

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2 solutions

Solution 1

Try this

C#

Regex regex = new Regex("^[a-zA-Z0-9 ]*$");

Posted 26-Sep-11 20:08pm

sachin10d

Comments

kami124 27-Sep-11 3:17am

but in this way it took multiple space as well

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Tejas Vaishnav · Accepted Answer · 2011-09-26T20:11:00

C#

protected void btn_Click(object sender, EventArgs e)
        {
            string t = txt.Text.Trim();
            bool test = true;
            for (int i = 0; i < t.Length; i++)
            {
                if (t[i].ToString().Equals(" ") && t[i - 1].ToString() == " ")
                {
                    test = false;
                    break;
                }
            }
            if (test)
                Response.Write("Valid");
            else
                Response.Write("INValid");
        }