Which of the following metacharacter is used to refer to any character?

The correct answer is: C. .

A metacharacter is a special character that has a special meaning in a programming language or command-line interpreter. The dot (.) is a metacharacter that can be used to refer to any character. For example, the regular expression .* matches any string of any length.

The other options are not metacharacters. The percent sign (%) is a special character in some programming languages, but it does not have a special meaning in regular expressions. The at sign (@) is a special character in some email addresses, but it does not have a special meaning in regular expressions.

Here are some examples of how the dot metacharacter can be used in

64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube