Regex find and replace a digit

To find only a single digit (such as “1”, or “2”) and replace (only) it, you have to add a plus after \d.

Something like:

(\d+)

(to find it) and

\1

to replace it.

For example you have to add a new element to these lines

1 some first text 
3 some other text
8 other text

You can use this regex

find: (\d+) replace: \n\1

as a result you will get

1 some first text 

3 some other text

8 other text