Build, test, and debug regular expressions
Matches quoted strings in Pug (Jade) templates that contain variable interpolation, e.g. "Hello #{name}!" or 'Hi #{user.name}'. It captures the opening/closing quotes, text before and after the interpolation, the full #{...} expression, and the variable name inside it. Commonly used for extracting template variables, i18n string extraction, or transforming Pug templates.