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Friday, October 19, 2012

Common Regular Expressions in ASP.NET

Some common regular expressions are shown here:

Common Regular Expressions



FieldExpressionFormat SamplesDescription
Name^[a-zA-Z''-'\s]{1,40}$John Doe
O'Dell
Validates a name. Allows up to 40 uppercase and lowercase characters and a few special characters that are common to some names. You can modify this list.
Social Security Number^\d{3}-\d{2}-\d{4}$111-11-1111Validates the format, type, and length of the supplied input field. The input must consist of 3 numeric characters followed by a dash, then 2 numeric characters followed by a dash, and then 4 numeric characters.
Phone Number^[01]?[- .]?(\([2-9]\d{2}\)|[2-9]\d{2})[- .]?\d{3}[- .]?\d{4}$(425) 555-0123
425-555-0123
425 555 0123
1-425-555-0123
Validates a U.S. phone number. It must consist of 3 numeric characters, optionally enclosed in parentheses, followed by a set of 3 numeric characters and then a set of 4 numeric characters.
E-mail ^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-zA-Z])@))(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$someone@example.comValidates an e-mail address.
URL^(ht|f)tp(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&amp;%\$#_]*)?$http://www.microsoft.comValidates a URL
ZIP Code^(\d{5}-\d{4}|\d{5}|\d{9})$|^([a-zA-Z]\d[a-zA-Z] \d[a-zA-Z]\d)$12345Validates a U.S. ZIP Code. The code must consist of 5 or 9 numeric characters.
Password(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$Validates a strong password. It must be between 8 and 10 characters, contain at least one digit and one alphabetic character, and must not contain special characters.
Non- negative integer^\d+$0
986
Validates that the field contains an integer greater than zero.
Currency (non- negative)^\d+(\.\d\d)?$1.00Validates a positive currency amount. If there is a decimal point, it requires 2 numeric characters after the decimal point. For example, 3.00 is valid but 3.1 is not.
Currency (positive or negative)^(-)?\d+(\.\d\d)?$1.20Validates for a positive or negative currency amount. If there is a decimal point, it requires 2 numeric characters after the decimal point.

ASP.NET TextBox.MultiLine maxlength

Add following javascript

function Count(text,long)
{
var maxlength = new Number(long); // Change number to your max length.
if(document.getElementById('<%=textBox.ClientID%>').value.length > maxlength){
text.value = text.value.substring(0,maxlength);
alert(" Only " + long + " chars");
}

Where “textBox” is the asp text box ID.
Also add following events in your textbox.

onKeyUp="javascript:Count(this,200);" onChange="javascript:Count(this,200);"

Your textbox code should look like





Solution Number 2 for

ASP.NET TextBox.MultiLine maxlength

Another way to achieve this is regular expression. You can add following regular expression validate on asp text box.

quot; runat="server" />



Hope this helps you!!!

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