Note that the regular expression is compiled using the System. This pattern can be repeated one or more times, and must be followed by the top-level domain name. [0-9a-z]*.) [a-z0-9][-a-z0-9][a-z0-9]))$` is interpreted as shown in the following table. If the character that follows @ is not an opening bracket, match one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by zero or more occurrences of a word character or a hyphen, followed by zero or one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by a period. To determine whether an email address is valid, pass the email address to the System.
Incase you didn't provide information in the format specified by the form field or leave it empty, the message will appear and form cannot be submitted until you get it right.
It is a very simple function which uses a regular expression pattern match to test if a email is of a correct format. This takes in a parameter of the email address and then runs a pattern match against the regular expression.
If it doesn't find any matches then it will fail the validation and the function will return false, if the match returns true then the email will be of a correct format and the function will return true.
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