MATLAB: Get number from a string

parsingstrings

I have a string that looks like this
I_am_a_String.562
I need to be able to pull the number out of that, and I was using the following to do so:
num = regexp(str, '\d+', 'match');
and that worked will I ran into strings like:
When lpdlogic21 is true....
and I started getting numbers that I didn't want, so I switched it to this:
num = regexp(lines{1}{jj}, '(?<words>\w*).(?<ID>\d*)', 'names');
but this didn't work for the off string either. It gave me num with about 20 entries in it. So my question is what can I use so I only get answers for the first string but none of the others. This is a basic question and I know I should know this by now, but I'm drawing a blank right now.

Best Answer

What do you mean it didn't work. Seems to work here. So what numbers do you want? Only numbers that are after a '.' or what (use: '\.\d+')? Be specific!
str = 'When lpdlogic21 is true....';
num = regexp(str, '\d+', 'match')
num = 
      '21'
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