Regex of numbers and commas in correct fomat for PHP app

I need a regex for my php app that confirms that the user entered text in the format of numbers separated with commas. For example:

1,2
1,2,3
6,4,5,3,2,1

There can be no other characters but numbers and com开发者_开发知识库mas.

Thank you, Mark

This regular expression should do it: (\d+,)*\d+.

Explanation:

\d+             One or more consecutive digits
\d+,            ...followed by a comma
(\d+,)*         ...and all of the above repeated zero or more times
(\d+,)*\d+      ...and finally ending with one or more digits

This expression will not allow an "extra" comma after the last number, or before the first number, or multiple consecutive commas.

I believe this is the regular expression you are looking for: \d+(,\d+)*.

It has the advantage of matching a single number without a comma, or a comma-separated list of numbers with no trailing comma.