Regex Help Needed To Match Numbers

I am an absolute noob at regex and need to help to match numbers in this format: 1,234,567 or 123,456 Including the commas! So I would like to match for example: 980,232 905,

Solution 1:

\d{1,3}(?:,\d{3})* to match correctly placed commas (4,43,424 won't match)

https://regex101.com/r/kQ6fC9/3

There can be 1-3 digits before the first comma, and then (,xyz) can repeat however times it wants, -,123,456, ,123,456,789 and also no times - just a number 13.

This works perfectly for whole (integer) numbers that may be divided by commas for readability. If you need to add also decimals to it, it means that the number after the last comma has no limitations. (?<=^|\s)\d{1,3}(?:,\d{3})*(?:,\d+)?(?=\s|$) should work for any number, including decimals, while avoiding faulty ones, https://regex101.com/r/kQ6fC9/4

Solution 2:

You can use following regex :

^(?:\d,)?\d{3},\d{3}$

See the demo https://regex101.com/r/yY3xR6/1

And read more about regex repetition http://www.regular-expressions.info/repeat.html

Solution 3:

Well, conditions you've stated are little bit vague. If you want to match any combinations of digits separated by commas you can use following pattern (yes, it is kinda broad): [\d,]+

See demo