A regular expression (abbreviated regex or regexp) is a sequence of text characters, some of which are understood to be meta characters with symbolic meaning and some of which have their literal meaning, that together automatically identify a given pattern.
A regular expression is very useful when the objects are dynamic in nature and we cannot store each and every object which follows a pattern in the OR. In the Flight Reservation application, we can open any existing order by the order number and send the fax. When the Fax window is opened, the title of the window contains the order number; this will cause an issue when we want to open the fax window with a different order number as the window is no longer the same. In this condition, we can use regular expression. Refer to the following screenshot; the identification property of the object is Fax Order No. 11. Here we convert the text property into a regular expression to identify the property as a pattern and not a...