I have been working with Flat Files recently, and I found Vim Search patterns can help with finding certain conditions within the file. This pattern works very well:
\{n}
Searches for n number of the preceding pattern.
For example, say you want to find any lines in the file that have a “2” in the 51st position of the file. You can use this pattern:
^.\{50}2
So, this matches 50 characters of anything and a “2” following.
Reference: