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Regular Expressions
A regular expression (shortened as regex) is a sequence of characters that define a search pattern. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. It is a technique developed in theoretical computer science and formal language theory.
Try it here: > https://pythex.org/
Presentation on Regular Expressions with examples
Want to see regular expressions in practice? Check out our webscraping series under the "Python Programming" level.