正则表达式适用于非数字，为什么不适用于数字？

Question

You can test it here: http://rubular.com/r/8tNjR6dVRu

Test String:

                                                                                   Folha: 1 /2
                                      História Escola

 Nome:              MARCOS MARCO MARCA                                                     1111111

 Data Nascimento:   7 de agosto de 2000

Result for

(?<=Nome:)(\D*)

MARCOS MARCO MARCA

( with spaces. Is there a easy way to remove it? )

Now, I wanted to get the numbers, I tried the logical

(?<=Nome:)(\d*)

But it doesn't work.

Can someone explain me why?

Thanks!

Answer 1

You want to MATCH the non-digits, but CAPTURE the digits:

(?<=Nome:)\D*(\d+)

This starts after the Nome: and ignores everything non-digit. Then it captures the digits.

Rubular demo