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a pattern describing a certain amount of text.
A '''regular expression''' is used in computer software to define a sequence of characters.<ref>"A regular expression, or regex for short, is a pattern describing a certain amount of text." [http://www.regular-expressions.info/quickstart.html Regular Expression Quick Start] </ref>
A regular expression is read from left to right and is processed one piece at a time. Certain characters have special meanings within the description of a regular language:
A regular expression is read from left to right and is processed one piece at a time. Certain characters have special meanings within the description of a regular language:
* '*' - the previous construction is matched 0 or more times
* '*' - the previous construction is matched 0 or more times