Rephrasing the contexts in which regex is useful

Per LibraryCarpentry#157.

episodes/01-regular-expressions.md

@@ -167,7 +167,9 @@ So, what are these going to match?
 > {: .solution}
 {: .challenge}
 
-This logic is useful when you have lots of files in a directory, when those files have logical file names, and when you want to isolate a selection of files. It can be used for looking at cells in spreadsheets for certain values, or for extracting some data from a column of a spreadsheet to make new columns. I could go on. The point is, it is useful in many contexts. To embed this knowledge we won't - however - be using computers. Instead we'll use pen and paper. 
+This logic is useful when you have lots of files in a directory, when those files have logical file names, and when you want to isolate a selection of files. It can be used for looking at cells in spreadsheets for certain values, or for extracting some data from a column of a spreadsheet to make new columns. There are many other contexts in which regex is useful when using a computer to search through a document, spreadsheet, or file structure.
+
+To embed this knowledge we won't - however - be using computers. Instead we'll use pen and paper. 
 
 
 ### Exercise