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

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

CodePudding user response：

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

CodePudding user response：

Using notepad , you can match 4 digits, then use \K to clear the current output buffer and match 1 or more digits.

\d{4}\K\d

See a

If you don't want partial matches, you can add word boundaries \b around the pattern.

\b\d{4}\K\d \b

See another regex demo