About BBEdit Pattern Playgrounds

The "Pattern Playground" window provides an interactive interface for experimenting with the behavior of Grep patterns (regular expressions). This makes the process of creating complicated patterns much less trial-and-error, since you can see exactly what will match, and how, before committing to any irreversible actions.

Choose "Pattern Playground" from the Search menu to open a shared window, or make a new pattern tester any time by choosing File => New => Pattern Playground. (You can have multiple pattern playground windows open.)

Pattern Playground window image

Here's a brief description of how the window works:

Additional notes and behaviors: