REGEX - Regular Expressions

Introduction to REGEX's

A regular expression (shortened as regex) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.

The concept of regular expressions began in the 1950s, when the American mathematician Stephen Cole Kleene formalized the concept of a regular language. They came into common use with Unix text-processing utilities. Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.

Source (after): https://en.wikipedia.org/wiki/Regular_expression

REGEX's cause as much confusion in Computer Science as does the concept of recursion.

This board has an aim to provide resources to demystify REGEX's.

REGEX Resources

This list needs to grow - along with "confidence ratings" of these sites:

• Wikipedia Overview: https://en.wikipedia.org/wiki/Regular_expression
• Simple Tutorial with examples: https://medium.com/factory-mind/regex-tutorial-a-simple-cheatsheet-by-examples-649dc1c3f285

(Please contribute further)

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