Write a function matchIPAddress($str) that takes a string representing an IP address as a parameter. The function should return true if the IP address is valid, and false if it is not. An IP address consists of a series of 4 numbers on the range 0-255 separated by dots (e.g. 192.168.0.1). Use regular expressions with capture groups and some additional validation in your solution (e.g. preg_match).]

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Hiring problem

The term "hire" means "to employ" or "to obtain services for a fee." When you hire someone, you are employing or paying them to perform a certain task for you. A step-by-step method for hiring a new employee is an efficient and successful hiring process in which a business determines its talent needs, recruits from its talent pool, and hires the best-qualified individuals. The hiring problem is a well-known decision-making problem in the analysis of algorithms. The problem is solved by designing an efficient algorithm to choose the best candidate from a list of n candidates.