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/**
* Namespace: System.Web.UI.WebControls
* Class: RegularExpressionValidator
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2002)
*/
using System;
using System.Web;
using System.Web.UI;
using System.Text.RegularExpressions;
namespace System.Web.UI.WebControls
{
[ToolboxData("<{0}:RegularExpressionValidator runat=\"server\" "
+ "ErrorMessage=\"RegularExpressionValidator\">"
+ "</{0}:RegularExpressionValidator>")]
public class RegularExpressionValidator : BaseValidator
{
public RegularExpressionValidator(): base()
{
}
public string ValidationExpression
{
get
{
object o = ViewState["ValidationExpression"];
if(o != null)
{
return (string)o;
}
return String.Empty;
}
set
{
try
{
Regex.IsMatch("", value);
} catch(Exception)
{
throw new HttpException(HttpRuntime.FormatResourceString("Validator_bad_regex", value));
}
ViewState["ValidationExpression"] = value;
}
}
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
base.AddAttributesToRender(writer);
if(base.RenderUplevel)
{
writer.AddAttribute("evaluationfunction", "RegularExpressionValidatorEvaluateIsValid");
string exp = ValidationExpression;
if(exp.Length > 0)
{
writer.AddAttribute("validationexpression", exp);
}
}
}
protected override bool EvaluateIsValid()
{
string ctrl = GetControlValidationValue(ControlToValidate);
bool retVal = true;
if(ctrl == null || ctrl.Trim().Length == 0)
{
return true;
}
try
{
Match match = Regex.Match(ctrl, ValidationExpression);
if(match.Success && match.Index > 0 && match.Length == ctrl.Length)
{
retVal = true;
} else
{
retVal = false;
}
} catch(Exception)
{
retVal = true;
}
return retVal;
}
}
}
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