Faraz Shah Khan

Regex to find URL within text and make them as link

Some time back on the form somebody was looking for some help in searching URL within text and make those URLs as link. Me and that guy tried various regex but the one that worked out I thought to put it on the blog so that it can help me and others later. Regex itself is:

-------- In VB.Net ---------
Dim regx As New Regex("http://([\w+?\.\w+])+([a-zA-Z0-9\~\!\@\#\$\%\^\&\*\(\)_\-\=\+\\\/\?\.\:\;\'\,]*)?", RegexOptions.IgnoreCase)

-------- In C#.Net ---------
Regex regx = new Regex("http://([\\w+?\\.\\w+])+([a-zA-Z0-9\\~\\!\\@\\#\\$\\%\\^\\&\\*\\(\\)_\\-\\=\\+\\\\\\/\\?\\.\\:\\;\\'\\,]*)?", RegexOptions.IgnoreCase);

And I used following method to convert the URLs into link within text.

-------- In VB.Net ---------
Protected Function MakeLink(ByVal txt As String) As String
        Dim regx As New Regex("http://([\w+?\.\w+])+([a-zA-Z0-9\~\!\@\#\$\%\^\&\*\(\)_\-\=\+\\\/\?\.\:\;\'\,]*)?", RegexOptions.IgnoreCase)

        Dim mactches As MatchCollection = regx.Matches(txt)

        For Each match As Match In mactches
            txt = txt.Replace(match.Value, "<a href='" & match.Value & "'>" & match.Value & "</a>")
        Next

        Return txt
End Function

------- In C#.Net --------
protected string MakeLink(string txt)
{
    Regex regx = new Regex("http://([\\w+?\\.\\w+])+([a-zA-Z0-9\\~\\!\\@\\#\\$\\%\\^\\&amp;\\*\\(\\)_\\-\\=\\+\\\\\\/\\?\\.\\:\\;\\'\\,]*)?", RegexOptions.IgnoreCase);
   
    MatchCollection mactches = regx.Matches(txt);
   
    foreach (Match match in mactches) {
        txt = txt.Replace(match.Value, "<a href='" + match.Value + "'>" + match.Value + "</a>");
    }
   
    return txt;
}

File Upload control AJAX effect

Since long I was wondering on how I will be able to use FileUpload control inside UpdatePanel and I am sure there will be lot of other people who were expecting the same to be working. I found an intersting video article by Joe Stagner in which he described how to use the FileUpload control inside iframe to give some AJAX effect. You can find this video here. http://www.asp.net/learn/videos/video-254.aspx

Mutually exclusive checkbox in GridView using Javascript

I response to one of my blog post entry I received few queries regarding mutually exclusive checkbox within GirdView, meaning if there are two checkboxes in a row only one can be selected at a time. If checkbox1 is selected and you select checkbox2 then checkbox1 should be deselected. Following javascript and html can be used.

<script type="text/javascript">
        function checkMutuallyExclusive(target)
        {
            document.getElementById(target).checked = false;
        }
</script>
.
.
.
<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" Width="400px">
        <Columns>
            <asp:TemplateField>
                <AlternatingItemTemplate>
                    <asp:CheckBox ID="cbStatus1" runat="server" />
                </AlternatingItemTemplate>
                <ItemTemplate>
                    <asp:CheckBox ID="cbStatus1" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                AlternatingItemTemplate>
                    <asp:CheckBox ID="cbStatus2" runat="server" />
                </AlternatingItemTemplate>
                <ItemTemplate>
                    <asp:CheckBox ID="cbStatus2" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
</asp:GridView>

Code Behind:

----------------------------------.vb file if VB.Net is the language ------------------------------------

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        If (e.Row.RowType = DataControlRowType.DataRow) Then
            DirectCast(e.Row.FindControl("cbStatus1"), CheckBox).Attributes.Add("onclick", "javascript:checkMutuallyExclusive('" & DirectCast(e.Row.FindControl("cbStatus2"), CheckBox).ClientID & "')")
            DirectCast(e.Row.FindControl("cbStatus2"), CheckBox).Attributes.Add("onclick", "javascript:checkMutuallyExclusive('" & DirectCast(e.Row.FindControl("cbStatus1"), CheckBox).ClientID & "')")
        End If
End Sub

----------------------------------.cs file if C#.Net is the language ------------------------------------

protected void GridView1_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
{
    if ((e.Row.RowType == DataControlRowType.DataRow)) {
        ((CheckBox)e.Row.FindControl("cbStatus1")).Attributes.Add("onclick", "javascript:checkMutuallyExclusive('" + ((CheckBox)e.Row.FindControl("cbStatus2")).ClientID + "')");
        ((CheckBox)e.Row.FindControl("cbStatus2")).Attributes.Add("onclick", "javascript:checkMutuallyExclusive('" + ((CheckBox)e.Row.FindControl("cbStatus1")).ClientID + "')");
    }
}