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