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Learn-by-doing regex tutorial. Persnickety about punctuation, but I guess it has to be!
What is regular expression (regex) and what makes it vulnerable to attack? Learn how to use regex safely and avoid ReDoS attacks in the process.
Visualizes regular expressions as a kind of workflow diagram.
Regular expressions are not just for programmers anymore; they are supported by common software and systems used for cataloging and metadata, and allow for very powerful search and replace, even complete reformatting of library data! In this webinar, we’ll discuss the building blocks of regular expressions, practice identifying what they match (and do not match!), and consider how we can use them to make everyday library work more efficient.
OpenRefine is a free, open source power tool for working with messy data and improving it - Understanding Regular Expressions · OpenRefine/OpenRefine Wiki
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java. Features a regex quiz & library.
RegexOne provides a set of interactive lessons and exercises to help you learn regular expressions
At Regular-Expressions.info you will find a wide range of in-depth information about a powerful search pattern language called regular expressions.
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Ruby-based regular expression editor/tester
Reggy is a small OS X cocoa/objective-c application to very quickly visualize what a given regular expression will match given a test string. It will also tell you if you have errors in your regular expression.
Reference of the various syntactic elements that can appear in regular expressions