A regular expression is a sequence of characters that defines a search pattern, typically used for finding or replacing specific text in strings.
For example, this is the regular expression for a number;
^\d+$ And this is a more complex one to match an email address;
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$Want to know more? Read the guide by clicking the button below.