Read Integer within a String

Question

I need to somehow read an integer within a string. The string will be as follows;

GAME_SWITCH(476)

And I need to read the 476 part. Note, it won't be 476 each time, but it will be "GAME_SWITCH(...)" each time. I've tried using the .delete methods to delete "GAME_SWITCH(" and ")", but that has no effect for some reason. I just want the "476" which I can then convert to an integer.

Furthermore, is there also a way to check if the string adheres to those rules? if the string is just "foobar" it returns false?

I am using Ruby 1.8.1

Thanks a lot!

score 0 · Accepted Answer · answered Mar 16 '12 at 19:10

0

You can solve the problem with regular expressions for example:

if m = str.match(/^GAME_SWITCH\((\d+)\)$/)
  m[1].to_i
else
  false
end

answered Mar 16 '12 at 19:10

KARASZI István

30,900
8
101
128

Hey, this worked! In order to convert to an integer properly, though, I had to use another variable, like int = str[1].to_i Thanks! – HarryE Mar 16 '12 at 20:01

score 0 · Answer 2 · answered Mar 16 '12 at 19:13

0

Try something like this

my_string.scan(/\d+/)[0].to_i

answered Mar 16 '12 at 19:13

Marlon León

171
13

Read Integer within a String

2 Answers2