Email validating regular expression policy and procedures importance of updating
If you look at the Wikipedia article for valid email address, it supports a lot of special characters. (DOT) and it can contain characters, digits and special characters – and _.
But to cover most of the valid email addresses, I am assuming an email address to consist of characters, digits and special characters , – , . Also every email address must contain only one @ symbol. So a subdomain can contain characters, digits and special characters – and _. The last TLD should be of minimum length 2 and can contain words only.
An email address identifies an email box to which email messages are delivered.
There is a good site to test , regular expression validator email , regexpal .
To validate other forms of input, such as query strings, cookies, and HTML control input, you can use the System. The attacker can then supply carefully crafted input that compromises your application by attempting SQL injection, cross-site scripting, and other injection attacks.
To avoid such vulnerability, you should validate text fields (such as names, addresses, tax identification numbers, and so on) and use regular expressions to do the following: Regular expression support is available to ASP. If you capture input by using server controls, you can use the Regular Expression Validator control to validate that input.
Here’s a Java example to show you how to use regex to validate email address. [email protected], [email protected], [email protected] [email protected], [email protected], [email protected] 3. Only email id containing (com , org )tld are valid .Email ids containing other than these tld are invalid email ids .One more important thing to note is that email addresses are case insensitive. So we will use case insensitive flag to create the pattern object.