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Regular expression is an object and describes a pattern of characters. It allows us to search for specific patterns of text. It also help match, locate, and manage text. The building blocks of regular expression are metacharacters and reserved meta-characters. You can create a regular expression for almost any pattern of text you think. The number of digits our regex will match for is the umber of digits we match for. Metacharacter is a special character with a special meaning or a literal meaning.