Having a-z and A-Z means that both lowercase and uppercase letters are allowed.
indicates the minimum and maximum number of characters.
If the input email address satisfies our regular expression, ‘test’ will return true otherwise it will return false. You can call this method whenever you want to validate email address.
How can I check if a given string is a valid URL address? Surely a good start: msdn.microsoft.com/en-us/library/ff650303NB. The above page is retired, but the expressions in the table are essentially still valid for reference.
This will allow domain names with 2, 3 and 4 characters e.g.; us, tx, org, com, net, wxyz).
: Finally, the email address must end with two to four alphabets.There are two keys to understanding why the automatic fallback works consistently in all major browsers: (unless "foo" is a recognized input type or "bar" is a recognized attribute of the input element).For each of the new input types, we present a high-level description, an overview of the syntax, a description of the main attributes, a summary of which current browsers support it, and an example you can experiment with in your browser.A regular expression can be a single character, or a more complicated pattern.
Regular expressions can be used to perform all types of text search and text replace operations.