Regular expressions are built into many programming languages and used to match, search, and transform patterns of text in your programs. Get started with Regex.

Gruber’s single-line version of the regex pattern can be pasted in Editorial’s If action with no modifications; inside the If block, the text in the clipboard is passed to a Find action that extracts ...

So the regex [Ff]rankfurter is the same as the above example. Brackets support ranges though, so ^[A-Z] will match any line that starts with a capital letter. It also supports numbers, so [0-9]$ will ...