The first number is the minimum number of characters and the second is the maximum number of a characters the input can be.If you just want to specify an exact number then send the same number for both minimum and maximum.This function will be identical to is Numeric except for the change to the regular expression we use inside the match function.Instead of checking for numbers we will want to check for all letters.If we wanted to see if a string contained only letters we need to specify an expression that allows for both lowercase and uppercase letters: /^[a-z A-Z] $/ .Being able to restrict the number of characters a user can enter into a field is one of the best ways to prevent bad data.Java Script also lets you display helpful alerts to inform the user what information they have entered incorrectly and how they can fix it.In this lesson we will be reviewing some basic form validation, showing you how to check for the following: This lesson is a little long, but knowing how to implement these form validation techniques is definitely worth the effort on your part.
We then used the match function with our regular expression.
The quickest way to check if an input's string value is all numbers is to use a regular expression /^[0-9] $/ that will only match if the string is all numbers and is at least one character long.
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