Regex: Select and Delete all content of file, except “DATE” format

Question

I have a file with many dates in the format of 03/07/2017.

For exemple:

My lovely letter can\'t be read...

academicsdire

Answer 1

You may use

Find What: (\d{1,2}/\d{1,4}/\d{1,4})|.
Replace With: (?{1}$1\n:) . matches newline: On

Note: You may also add word boundaries around the date pattern to make it a bit more precise, \b(\d{1,2}/\d{1,4}/\d{1,4})\b|..

Now, (\d{1,2}/\d{1,4}/\d{1,4}) will match and capture the date into Group 1 and if not found at the current location, . will match any char there. In the replacement pattern, the date is replaced with itself and a newline is added after it, and if Group 1 is not matched, the char is just removed.