This means that as a programmer, you have the power to supply the exact pattern for the input you desire in any text input field. They make use of a pattern matching system to match the input with a certain pattern of data. Regular Expressions are extremely powerful. So what can we do? The answer is simple: Use Regular Expressions! That is what they were invented for. Also, the more tests you are performing, the slower your app might become. Well, sometimes a good structured and thought out If statement can suffice, but it can become quite long and cumbersome in the future. There are some more tests, but I want to keep this article straightforward and basic enough. For example : If you are only supposed to type in 50 characters, you must not be able to enter more than fifty. Range test – This tests checks to see if entered values are within a specified range.For example: If a user is supposed to enter a name, numbers and some special symbols must not be allowed. Permitted Character test – This test ensure that no illegal characters are entered.For example: Integers of dates that do not need conversion afterwards. ![]()
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