How to select this piece of text in Regex

Dude, go through the lines and apply:

^\s*[0-9\.]*\s*

This regex removes what you intend ... just that it has to be run row by line, with a FOR or a WHILE and giving a replace of the value found by ''.

If you prefer, you can use the regex below and substitute a line break (\ n):

(^|\n)\s*[0-9\.]*\s*

If I understand correctly you want to filter some of the content and want to replace it.

So even if there is something else you want it will always be something like:

  

1.1.1.1.1. Test.
   1.1. Test.
   1. Testing.

You have also commented on the tree, in this case there may be other indexes such as:

  

1.43.7.112. Test.
   26.0.177. Test.

But you want to remove the indexes by keeping only the text.

Result

pattern : /(\d+\.)+ (\w)/g
replace : $2

Explanation

• (\d+\.)+ - This part takes care of the indexes, as it is a group with + , it repeats the possibility of the group the maximum that achieves, being at least 1.
• - Literal space (I believe that after the index you have a spacing)
• (\w) - Group 2, REGEX limit to know when the text started.

replace replaces everything that was captured.

• $2 - replaces the entire sentence with the character captured in group 2.

See working at REGEX101 .

I recommend doing regular expressions, gradually, in parts. Look how I've built a expression to validate emails .

Come on, catching the most general:

.*

Here we get everything married, so let's filter. It is necessary to pick up from the beginning, so we can put the anchor ^ logo:

^.*

Hmmm, you also said that you want everything until you get the first letter ... so we can marry anything but letters, what's up? Let's use the denied list for this:

^[^A-Za-z]*

Well, let's just make sure it goes up to a letter? Let's use the list for this, and we can also group for a possible text replacement in the future:

 ^([^A-Za-z]*)[A-Za-z]

Ok, now we have the desired text in the grouping recognized by the mirror = D

  

More about regex see the Aurélio Verde's Quick Guide to Regular Expressions .