Regular Expression for number.(space), objective-c

I have an NSArray of lines (objective-c iphone), and I'm trying to find the line which starts with a number, followed by a dot and a space, but can have any number of spaces (including none) before it, and have any text following it eg:

    1. random text
           2. text random
3.

what regular expression would I use to get this? (I'm trying to learn it, and I needed the above expression anyway, so I thought I'd开发者_StackOverflow中文版 use it as an example)

With C#:

@"^ *[0-9]+\. "

It doesn't check for the presence of something after the ., so this is legal:

1.(space)

If you delete the @ and escape the \ it should work with other languages (it is pretty "down-to-earth" as RegExpes go)

I may suggest (Perl-compatible regexp):

^\s*\d+\.\s

At the beginning of a line:

• Any number (0-n) of spaces
• One or more digits
• A dot
• A space

Something like

^\s*\d+\.

But it depends on the language.

/^\s*[0-9]+\.\s+/

would be my guess providing you don't have any space before the number