Regexp Tools
Reguläre Ausdrücke sind eine feine Sache. Daher der Verweis auf die Firefox Extension Regular Expressions Tester.
The Regular Expressions Tester is a Mozilla Firefox extension for testing regular expressions. Regular expressions are used for complex string validation and manipulation. For example they can be used for checking an email address for correct syntax, which the user entered into a form. Regular Expressions Tester is used for validating these expressions and is therefore usefull for developers of software and web applications.
Allerdings verwende ich eher RegExr Desktop da man ja eh schon so viele Extensions installiert hat.