Regular expression for validating date in asp net
Compilers use Regular Expressions to validate the syntax of programs.
If the program code does not match the Regular Expression then the compiler indicates that there is a syntax error. When a user clicks the OK button, the program checks to ensure that none of the fields are empty.
They can be useful during information validation, to ensure that data is in a specified format.
For example, a ZIP code must consist of five digits, and the last name must start with a capital letter.
This kind of situation is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their Validation Group property.
The client side validation is accomplished through the Client Validation Function property.
The client side validation routine should be written in a scripting language, such as Java Script or VBScript, which the browser can understand.
For example if you want to validating Indian mobile numbers followed by 91, then you can use the following regx: Have worked primarily in the domain of Calling, CRM and direct advertisers services. If one or more fields are empty then the program displays a message to the user that all fields must be filled in before the program can validate the input information.The code above calls the first Name Text Box's Focus method to place the cursor in the first Name Text Box.You can use them to constrain input, apply formatting rules, and check lengths. By using capturing groups to remember each set of digits, the same regular expression can be used to replace the subject text with precisely the format you want. Regex class for validate any input string for any specific format.
If you just need to check something like if input string has no more than 5 characters and contains only digits you can do that easily using Int32. Programmers often avoid learning of regular expressions because they look difficult on the first look.