I need a regular expression for a list of numbers in a text box

Question

Asked: May 14, 20262026-05-14T01:08:53+00:00 2026-05-14T01:08:53+00:00

I need a regular expression for a list of numbers in a text box with carriage returns and line feeds, but no other characters.

e.g.

I have this:

Regex(@"\d\r\n${0,}?");

… but it is accepting commas when I paste them into my text box:

e.g.

Can someone please tell me what I’m doing wrong?

Thanks

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Editorial Team · Answer 1 · 2026-05-14T01:08:53+00:00

Quite a lot is wrong with your Regex =)

\d matches one number, not several
$ matches the end of the line, {0,} means, that the symbol before it may appear zero or more times. But zero or more end of lines are not very useful.
The ? is superfluous, I think.
You are missing the start of line character.

Your regex matches the example you have given, because it matches the “8” in the second line.

Use this regex instead:

"^(\d*\r\n)*$"

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