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what is regex and where i can learn

what is regex and where i can learn it for java

10/28/2017 5:31:12 PM

Ashish Kumar

6 Answers

New Answer

+22

regexr.com

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Definition: https://en.m.wikipedia.org/wiki/Regular_expression I'm sure you can find tutorials on the internet very easy. To use regex in Java you can use the Pattern class, see https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html

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A regular expression, regex or regexp (sometimes called a rational expression) is, in theoretical computer science and formal language theory, a sequence of characters that define a search pattern. Usually this pattern is then used by string searching algorithms for "find" or "find and replace" operations on strings. http://www.vogella.com/tutorials/JavaRegularExpressions/article.html

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You can also practice and check your regex patterns here: www.regex101.com At least for Python, JavaScript, PHP and GoLang.

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thanku friends

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Also the Python tutorial of Solo Learn has a very good section about Regular Expressions (beginner level but clear and useful!)