If an user miss out any field, than the form will display error message.
function input Alphabet(inputtext, alert Msg) // Function that checks whether input text includes alphabetic and numeric characters.
function text Alphanumeric(inputtext, alert Msg) // Function that checks whether the input characters are restricted according to defined by user.
By combining the expression for numbers and alphabetic characters, there is an expression that checks, whether the entered things includes numbers and alphabetic character or not.
The expression for matching numbers and characters in the field is: /^[0-9a-z A-Z] $/ It’s must to provide validation in the select field.
Regular expression helps you in pattern matching in string. : Matches any single charcter except a new line : Matches the preceding character or repeated character. The basic expression for matching entered value as number in the field is: /^[0-9] $/.