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Regex

Test and understand regular expressions.

Regular expressions: syntax, groups, and the mistakes that break them.

  • Regex Groups and Captures

    How capturing and non-capturing groups work in a regular expression.

  • Regex Syntax

    A reference for the core regular-expression syntax: classes, quantifiers, anchors, and groups.

  • Common Regex Mistakes

    The regular-expression mistakes that cause failed matches and catastrophic backtracking.