How to make a replace in a string irrespective of string length?

[ppr (Peter Preuss)]

@Sirimalla_Karthik_Chandra

I need another help as well. Can we extract data from a string in between first 6 characters and last 4 characters irrespective of length of the string.

with the same pattern from @Yoichi you can extract the middle string with Regex.Match

System.Text.RegularExpressions.Regex.Match(yourString,"(?<=^.{6}).*(?=.{4}$)").Value

For stepping into the topic of Regex also have a look here:
[CheatSheet] - System.Text.RegularExpressions | RegEx - News / Tutorials - UiPath Community Forum