Does MATLAB require a 2nd REGEXP to match data values obtained from a previous REGEXP?

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Brad
Brad 2013-5-24
I've got a set of commands that look like this:
str = 'Part ID: 1 or Part ID: 2 or Part ID: 5 or Part ID: 10';
exp = '*?Part ID:\s+(\d+)';
tokens = regexp(str, exp, 'tokens');
Part_data = reshape(str2double([tokens{:}]), 1, []).'
The objective of the code is to match only Part ID values 2 and 5. MATLAB is easily extracting all 4 part IDs with the commands above. However, I can't get MATLAB to read ONLY values 2 and 5.
I've been seearching Mathworks and using the MATLAB documentation in hopes of answering the following question: Does MATLAB require a 2nd REGEXP to match data values obtained from a previous REGEXP? Or am I making this harder than it is?

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Walter Roberson
Walter Roberson 2013-5-24
exp = 'Part ID:\s+([25])\W';
The expression will match as many times as needed

更多回答（1 个）

James Kristoff
James Kristoff 2013-5-24
The quick solution to the objected you stated is to use a more specific regular expression, i.e. if you only want the values 2 and 5:
exp = '*?Part ID:\s+([2|5])';
The real question is:
  • what is the actual motivation behind your question?
Meaning, if you just always want to get 2 and 5, then why not have a static vector of 2 and 5.
  • What makes 2 and 5 special/different from 1 and 10?
It is that difference or uniqueness that you should use to isolate the values you want in a more generic algorithm.

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