PHP正则表达式。 必须以特定字词开头，并在任何数字之后。 不能有空间

Question

I'm trying to figure it out a Regular Expression that matches. I looked at a few answers to similar questions but I couldn't figure it out the last part of it.

This is what I got, just want to make sure if it covers everything and it doesn't have false matches...

/^(cdn|ns|CDN|NS)([0-9])*$/

My goal is to match any entry that starts with cdn or ns and have 0 or more numbers (only numbers) after. It can't have any space before, in the middle or after.

I hope this is not a duplicated, I spent about an hour going through the suggested answers.

Thanks!

Answer 1

Use this for one or more spaces. Good luck! :)

$regex = "~^(?:cdn|ns) *[0-9]*$~i";