Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Once you have an HTML form up and running, you will often want to make sure that all the important fields are filled in.
escaping - by -) [0-9] : It matches digital number from 0-9. That means, you could be very sure about the form, whether users have entered the details or not.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] $/. [A-Z] : It matches characters from uppercase ‘A’ to lowercase ‘Z’. The codes for checking form empty fields are given below: There is an expression that checks whether the string contains only alphabets or not.If you use the following script and Perl source you will know how to validate an entire form at once, displaying a series of error messages that your reader can then go back and fix.In the head portion of your HTML, you should create a script to do the form validation: See the validation script in action.