Regular expression

A Regular expression is a text pattern that describes how textual input should be parsed to retrieve a piece (or complete) of the textual input.

For regular expression we advise you to look at an internet site dedicated to regular expressions: http://www.regular-expressions.info/tutorial.html

An online regular expression tester can also be used to verify the correctness of the regular expression: https://regex101.com/

Links

• Wikipedia: Regular Expression
• Regular expression tutorial: http://www.regular-expressions.info/tutorial.html
• Regular epxression tester: https://regex101.com/