Notepad++ replace specific number with up to it's first 4 digit

Question

I want to find those number which contains more than 5 digits and replace it with first 4 digits. Used below Regex to find number which contains more than 5 digits.

[0-9]{5,}

How Can I achieve blow output?

99999999 -> this will replace with 9999
12345.66 -> this will replace with 1234.66 
1234 -> Remains unchanged

Answer 1

This one should do it:

The regex

([0-9]{4})[0-9]+

• takes the four numbers as first (and only) group
• requires at lease one more number behind
• replaces the complete match with the first (and only) group