Regular expression

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A topic known well beyond its field, found in many languages.

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A regular expression (shortened as regex or regexp), sometimes referred to as a rational expression, is a sequence of characters that specifies a match 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.

Excerpt from the Wikipedia article “Regular expression”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Konrad Jacobs, Erlangen, Copyright is MFO, CC BY-SA 2.0 de, via Wikimedia Commons.