Regular Expressions

Last updated: January 18, 2021

Learning resources

• Regular Expressions for Regular Folk

Tools for testing regex

Web-based, language-specific

Each programming language may have slightly different regular expression support. The following sites are convenient for testing regex for specific languages.

• Python: Pythex or PyRegex
• Ruby: Rubular

Web-based, general purpose

• RegExr, which has a nice interface for visualizing how regex work

Mac, general purpose

• Expressions
• Patterns