Regex - How To Validate ID Number

Sep 7, 2010

I am new at this so be easy on me... :)

I need to validate if a the ID number that the user typed in my site is a valid ID.

How do I check it?

Do I need to use RegularExpressionValidator?

More over, I also need to validate the credit card number, I found a few RegularExpressions for that in the net but each one is different from the other and I am not sure which one to use.. Does anyone know od a working expression that will suit all credit cards?

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C# - Email Validate ( Not Only Regex)?

Jan 9, 2011

I want to validate complete Email address. I am not asking to match using pericular string. but suppose someone enter email id then first the bnm should be validated and if such domain found then also it should check for such is available or invalid.???

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25 Digit Random Number Generator & Validate The Number When It Will Be Entered For Checking

Apr 27, 2009

how i can generate a 25 digit number for indentification (mail it to the user ) & how i shall check , when the user enter this number that it is valid or not ?

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Nov 19, 2010

I have this simple regex string to validate emails. It worked fine until someone came along with an email address that contained an ampersand:


how I can alter this to accept the & symbol? I have tried countless ways with no success.

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C# - Regex To Get Page Number From The Url?

Jul 4, 2010

I am currently using this regex to get the page number from the url:


Which worked fine for urls like:


My urls now have some additional querystring values (optionally), so the current regex is not working for these cases.

So now I need a regex to support:


I am using a route with wildcards so I can use the built in mvc for this.

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C# - Understand This RegEx Statement / Validate Filename From Asp FileUpload Control To Allow Only Jpeg And Gif Files?

Feb 18, 2010

Please help to understand this RegEx statement in details. It's supposed to validate filename from ASP.Net FileUpload control to allow only jpeg and gif files. It was designed by somebody else and I do not completely understand it. It works fine in Internet Explorer 7.0 but not in Firefox 3.6.

<asp:RegularExpressionValidator id="FileUpLoadValidator" runat="server"
ErrorMessage="Upload Jpegs and Gifs only."

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Finding Regex Pattern For Phone Number?

Dec 14, 2010

I want regex pattern for phone number as follow.


area code should be entered in paranetheses is mandatory after area code there should be hypen and only three digit should be allowed to enter that is mandatory after 3 digit again hypen should be there that is mandatory and then 4 digit should be enter that is mandatory.

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Regex Validator, Required Field Of Any Number?

Feb 22, 2011

I'm trying to use the regular expression validator for a numeric ID field.The field needs to be a required field of any number.Currently, I'm using:


Shouldn't this make it so the user has to at least enter 1 digit?? If I hit the submit button with the field empty,it passes validation and posts back.But if I enter non-numeric characters, it errors fine. If I wanted zero or more occurrences,I'd use:


Why isn't this working? Do I need to use this in combination with a Required Field Validator? That would suck ><

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Web Forms :: Regex Formatting Raw Number To Currency Format?

Aug 16, 2010

I am trying to take user supplied raw numeric values (these numbers dont have decimal point) and correctly format the values to their correct currency display.

eg: user enters 2341 the routine would use regex to format it to 23.41

I cant find a way to do this. What I have tried is this:


It doesnt work.... sNjunk always comes out 299 instead of 2.99.Anyone out there that can help me with this? or point me in the right direction?

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Regex.Split Extract Only First Number Form A String

Oct 6, 2010

I am using the following code for extracting a number from string 'sentence'.

Regex.Split(sentence, @"D+");

For Ex: This is test , message contains 192837 and the message ends here.

This output would be 192837.

Now, Let say: sentence is: This is test, 2736 message contains 293743 and message ends here.

This output would be 2736293743.

But, I want only 2736. i.e The first number in a string omit rest all others.

How to deal with this?

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Mar 25, 2011

I have the following regex to check if a number with 11 digits are entered


Now I instead want to check if the number has 11-14 digits, how should I change my regex?

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Performing A Regex Replacement / Get The Number Right After The Work LINK

Nov 12, 2008

I need a function that can search a string for the word "LINK".

Thing is... I need to get the number right after the work LINK, like say LINK8943

and replace it with "<a href=blah.aspx?8943">LINK8943</a>"

The number can change, but the function should still know to take any number after the work link and format a link for it.

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Dec 19, 2010

I have been trying to figure out how to use <asp:requiredfieldvalidator> with ValidationExpression but am having a difficult time understanding the syntax of ValidationExpression. I'd like to make sure one textbox's number (1-12) is equal to or higher than the other textbox's (1-12) number. How is this accomplished and what's the syntax of ValidationExpression (hopefully I'm stating the question correctly).

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Regex Code That Checks A Filed Contains At Least 1 Number, 1 Alphabetic Letter, 1 Special Character?

Sep 29, 2009

I am looking for a regex code that checks a filed contains at least 1 number, 1 alphabetic letter, 1 special character, and must consist of at least 6 characters.So far I have this -


But it doesnt check If an alphabetic letter has been entered. Anyone know what I need to add? I cant get me head around regex code!

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Validate After Certain Number Of Postbacks

Oct 18, 2010

I have a peculiar situation at hand in which I need to validate a pair of dates in an ASP.Net web app.This is how my page looks like : I have a "From Date" field which consists a set of three dropdownlists ( for Year , Month and Date) I have a "To Date" field which also consists a set of three dropdownlists ( for Year , Month and Date). There is a "Download Report" button on the screen ( which allows a user to download a report for the specified date range) All these six dropdownlists are wrapped in a user control. Now all the 6 dropdownlists have a default "please select" value. When a user lands on the page for the first time , all dropdownlists are set to "please select". The "Download" button is enabled only after valid 'From' and 'To' dates are selected. Now my requirement is that :

When a user lands on the page for the first time , no attempt to validate the dates should be made until he selects all the 6 dropdownlists at least once. When the 6th dropdownlist is selected , the From and To dates should be validated. Once a user has selected all 6 dropdowns once , subsequently on every dropdownlist postback , the dates should be validated. My Issue: What's the best way to track these 6 distinct postbacks ( for each of the dropdowns) before starting to validate the From and To Dates.
I could maintain a flagin ViewState .. but is there a better way?

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Dec 17, 2010

how to validate textbox to be number only by using custom validation, I mean what is the code?

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Validate Creditcard Number In Textbox?

Feb 10, 2009

I have created a Textbox for my credit card number entry for my payment webpage. how to make sure 16 digits of the number is entered . Methods such as count or something which i completely forgot?!

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C# - What Are The Condition To Validate A Phone Number

Dec 3, 2010

What are the condition to validate a phone number?

Well firstly it has to be a numerical value, can include the following numbers 0123456789 and the plus symbol. +

But what about the following conditions, where do you get this data?

-It has to be in the format [country dial code + area code + phone number]

-It has to be a min and max length

EDIT: also what is the min and max length of a mobile/cell phone number?

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Sep 13, 2010

How to Validate the Range of Number


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Aug 17, 2010

I have requirment to prevent enteries of same number occuring multiple times. Like 99999,1111111, 6666, are invalid. How can I acomplish this? Is there any general license validator funtion some one has writte?

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Jul 23, 2010

i have imported data from excel to datatable but i need to validate port no column which should

allow only numeric value and also i need to check the single quotes and need to replace to double quotes.

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Mar 28, 2011

how can i validate a textbox with 5 number only are allow to fill in and first number must number 3. For example like 3XXXX,3YYYY (X and Y are number).

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Nov 17, 2010

I've a Textbox

I can enter a Number which is greaterThan "0" or I can enter text which is only "NUMEROUS"


If I enter 0 (or) negetive Number (or) any text other than "NUMEROUS", i must display error msg Like

"Don't Enter 0/Negetive No./text other than "NUMEROUS"

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Mar 30, 2010

it's a multiline TextBox the MaxLength property does not work. At the moment I only see the option to use a CustomValidator with checking TextBox1.Text.Length on server side and perhaps in addition some Javascript client side validation.But isn't there a simpler way to do this, using the standard ASP.NET validators (RegularExpressionValidator, RangeValidator, CompareValidator, etc.)

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Web Forms :: Validate Number Inputed Is Inbetween Ranges Sotred In A SQL Database?

May 26, 2010

I have a SQL database with a table storing three collums. ClientID, StartRange, EndRange.The user needs to add records to a different table - the number being inputted by the user eeds to fall in the range where it is equal to the client he is adding if for. There can be a number of different ranges for a client which where I am falling over, it would be easier if it was just the one range!What is the best way to check this- I was thinking a customer validator method in the code behind?Would I need a Stored Proceedure? or some DataSet Tables and some how parse the ranges?

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Using RegEx With LINQ - Insert A Value Into The Regex?

Feb 19, 2010

I'm having a little trouble with using regex in linq. I want to be able to perform a search on values in my database. The goal is to insert a value into the regex and then use that to search a column in a table in my database for that term. I want it to work so that it gets all exact matches and also returns matches in which the search term is a substring of the term in the column.

I was trying to follow this tutorial on msdn, but it doesn't quite fit perfectly with my problem:




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Name Or Number Search In Textbox While Entering The First Letter Or Number Charactor Or Number?

Feb 2, 2010

I am using the and framework 2.0 with Ajax enable web.i have a text box and when user will enter "a" or number in this will search the name started from "a" character or number if he or she enter the number basically we can say live-search.

Employee search: Textbox.In this text box she/he will enter the first character of name or first number of employeeno and according to the a character name will search in list.

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Web Forms :: Validate Email ID And Also Validate Empty Textbox Using RegularExpressionValidator Control?

Nov 9, 2009

I have used below code for validating email id using RegularExpressionValidator....but the below code only validate email id...I want validatate empty textbox also..

ErrorMessage="Enter Valid Email ID" ControlToValidate="txtemailaddress"

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Oct 25, 2010

I'm trying out the jQuery Validation plugin jQuery Docs Here is the markup of my form:

<% using (Html.BeginForm("action", "contoller", null, FormMethod.Post, new { id = "sxform" })){%>
<div id="manifest">
Manifest Option:<br />
<%= Html.DropDownList("docid", ViewData["manifests"] as SelectList, new { @class = "required" })%>
<div id="release">
Release Version:<br />
<%= Html.TextBox("release", null, new { @class = "required" })%>
<div id="locale">
Localization:<br />
<%= Html.DropDownList("localization", ViewData["localizations"] as SelectList, new { @class = "required" })%>
<div id="label">
Label:<br />
<%= Html.TextBox("label", null, new { @class = "required" })%>
<div id="session">
Session ID (optional):<br />
<%= Html.TextBox("sessionInput", null, new { @class = "required" })%>
<div id="submit"><input type="submit" value="Build" /></div>
<% } %>

I am using MS MVC HTML Helpers to render this form. The resulting markup looks fine. IE each input and selection element contains the attribute 'class' with the value 'required'. When I submit this form the validation does noting.

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