Regex to get first number in string with other characters

Question

I\'m new to regular expressions, and was wondering how I could get only the first number in a string like 100 2011-10-20 14:28:55. In this case, I\'d want it to

Answer 1

the below code would do the trick.

Integer num = Integer.parseInt("100 2011-10-20 14:28:55");