Regular Expressions - University of California, Irvinedjp3/classes/2014_01_INF141/Lectures/... ·...

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Regular ExpressionsIntroduction to Information Retrieval INF 141/ CS 121 Donald J. Patterson

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Regular Expressions

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Regular Expressions

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• Most programming languages support regex’s

• Most have there own quirks

• These instructions are for regex’s in Java / Eclipse

http://www.vogella.com/tutorials/JavaRegularExpressions/article.html#regexjava

Regular Expressions

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• Regular Expressions are about finding patterns in text

• Based on a line by line paradigm

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Regular Expressions

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http://www.vogella.com/tutorials/JavaRegularExpressions/article.html#regexjava

Regular Expressions

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http://www.vogella.com/tutorials/JavaRegularExpressions/article.html#regexjava

Regular Expressions

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http://www.vogella.com/tutorials/JavaRegularExpressions/article.html#regexjava

Regular Expressions

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Backslashes

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Backslashes

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Backslashes

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Pattern and Matcher

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Example: Phone Number

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Online checker

RegexPlanet

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