Find pattern HH:MM in Notepad++ with a regular expression

I’m using the latest version of Notepad++.

I have a text file and I want to delete all the characters except this one: (14:32).

The text if a list of lessons in a online course and I want to extract the time to sum all of them because I want to know how long it is.This is an example of the text:

Lecture 1.
    Programming robots (15:32)
    Understanding ROS (8:20)

I want to remove everything to get something like this:

(15:32)
(8:20)

I have tried these regular expressions:

^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$

/^(0?[1-9]|1[0-2]):[0-5][0-9]$/

But I can’t find anything with them.

How can I find this pattern in Notepad++?

Maybe, it could be easier find all the characters ([a-z][A-Z]) and replace them with nothing.

>Solution :

You can use

Find What: ^.*(\((?:[01]?[0-9]|2[0-3]):[0-5][0-9]\)).*
Replace With: $1

See the regex demo.

Details:

• ^ – start of string
• .* – any zero or more chars other than line break chars as many as possible
• (\((?:[01]?[0-9]|2[0-3]):[0-5][0-9]\)) – Group 1:
  • \( – a ( char
  • (?:[01]?[0-9]|2[0-3]) – an optional 0 or 1 digit, and then any one digit, or 2 and then a digit from 0 to 3 range
  • : – a : char
  • [0-5][0-9] – minutes part (a digit from 0 to 5 and then any one digit)
  • \) – a ) char
• .* – the rest of the line.