Select numbers smaller than 10000 using regex in notepad++

I have a very long list that following is a part of it:

English

4,000,000

AfricanAmerican

1,771,000

Irish

1,100,000

Dutch

800,000

German

700,000

Scotch-Irish

0-640,000

NativeAmerican

=0=500,000

Scottish

450,000

Russian

15,000

Austrian

5000

Finnish4000

Swiss

+4000

1820

Now I want to select all comma separated numbers and numbers smaller than 10000 using regex in notepad++

Following regex is good for comma separated numbers but it can't select numbers smaller than 10000:

\d{1,3},\d{3}

how to modify it to select numbers smaller than 10000 too?

note that regex must select numbers that combined with words too, like Finnish4000

Solution

You might use an alternation, and rule out 1-4 digits numbers that start with a zero.

To prevent partial matches, you can assert no digits to the left and the right.

(?<!\d)(?:\d{1,3}(?:,\d{3})+|(?!0)\d{1,4})(?!\d)

The regex matches:

(?<!\d) Assert not a digit to the left
(?: Non capture group for the alternatives
- \d{1,3} Match 1-3 digits
- (?:,\d{3})+ Repeat 1+ times , and 3 digits
- | Or
- (?!0)\d{1,4} Negative lookahead, assert not a zero to the right and match 1-4 digits
) Close the non capture group
(?!\d) Assert not a digit to the right

See a regex demo