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Here is the example program using the above-given pattern.

This part will take care of the day part and will not allow anything less than 01 and more than 31. The (0||) pattern means any one of ( a) 0 and any digit between 1 and 9 ( b) 1 or 2 followed by any digit between 0 and 9 ( c) 3 followed by either 0 or 1. This will take care of our month part and will not allow months less than 01 and more than 12. The (0|1) means either 0 and any digit between 1 and 9 or 1 followed by 0, 1, or 2. Then, create a regular expression object with the pattern /hi/gi.The ignore flag (i) allows re object to ignore cases when executing the search and the global flag (g) instructs the re object to find all matches, not just the first one.Third, execute the exec() method until no match found.

Here is the updated pattern \\d means any 4 digits and will be used to validate the year part of the date. How it works: First, declare a message string that will be used for searching. Let’s try to include some rules as well like month cannot be less than 1 and more than 12 and day cannot be less than 1 and more than 31. But how about input date string “” or “”? Well, even though the dates are wrong, both of them will pass our date validation regex because it is syntactically correct. If the text property for the caption is 'Report.txt - Notepad', meaning Notepad is open with a file called Report.txt, the pattern matches because it contains the string 'Notepad'. This pattern requires the word 'Notepad' to appear anywhere within the value. It worked for the sample dates we provided. You can use a regular expression on the caption property to verify that the word 'Notepad' appears in the banner.