Ruby: How to find out if a character is a letter or a digit?

Question

I just started tinkering with Ruby earlier this week and I\'ve run into something that I don\'t quite know how to code. I\'m converting a scanner that was written in Java into R

Answer 1

The simplest way would be to use a Regular Expression:

def numeric?(lookAhead)
  lookAhead =~ /[0-9]/
end

def letter?(lookAhead)
  lookAhead =~ /[A-Za-z]/
end