Regex class for validate any input string for any specific format.
The reference contains a brief description, and examples of use, for each function!
Java Script is a programming language commonly used in websites to perform functions that the HTML cannot do.
Using client side Java Script is an efficient way to validate the user input in web forms.
When there are many fields in the form, the Java Script validation becomes too complex.
If $int is not an integer, the output will be: "Integer is not valid": For a complete reference of all filter functions, go to our complete PHP Filter Reference.
Check each filter to see what options and flags are available.
There are many events available, but these are the ones you are most likely to use: The following example has two Java Script functions defined in the header, which are activated by clicking on the links.
Note that each link shows a different way of calling the function, you would only need to pick the one that suits you.
Java Script can be a powerfull tool when used properly, and good scripts can make websites feel professional and easier to use.
Bad scripts, or badly implemented scripts, can make a website annoying or prevent it from working alltogether.
Regular expressions are a good way to validate text fields such as names, addresses, phone numbers, and other user information. A regular expression can easily check whether a user entered something that looks like a valid phone number.