How do I use REGEXP to match multi-digit values?

6 次查看（过去 30 天）
Brad
Brad 2013-11-6
评论： Brad 2013-11-6
I've been reviewing the MATLAB Programmer's Guide in hopes of finding a solution to a current problem: How do I use REGEXP to match multi-digit values?
From earlier this year, I have the following commands:
str = 'Part ID: 1 or Part ID: 2 or Part ID: 5 or Part ID: 10';
exp = 'Part ID:\s+([25])\W';
tokens = regexp(str, exp, 'tokens');
Part_data = reshape(str2double([tokens{:}]), 1, []).'
These commands work great when I'm looking to match up single digit values like 2 and 5.
Now, let's use the following updated string and associated commands;
str = 'Part ID: 112 or Part ID: 220 or Part ID: 252 or Part ID: 106';
exp = 'Part ID:\s+([220])\W';
tokens = regexp(str, exp, 'tokens');
Part_data = reshape(str2double([tokens{:}]), 1, []).'
This results in Part_data = NaN
I get the same result when trying to match the value of 112.
If possible, how do I use REGEXP to match only these two multi-digit values?
  1 个评论
Cedric
Cedric 2013-11-6
But what is the purpose? It seems to me that even if you were doing it right, you would essentially get 220, which is not a parameter or data (as you already know it). If you just want to see if there is a part 220, STRFIND might be more efficient. If you want to extract data that follow the header 'Part ID: 220', you should explain a bit more about the structure of the data, because it might be possible to extract it with a unique call to REGEXP.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-6
str = 'Part ID: 112 or Part ID: 220 or Part ID: 252 or Part ID: 106';
exp = '(?<=Part ID:) 220';
m = regexp(str, exp, 'match')

更多回答（1 个）

Kelly Kearney
Kelly Kearney 2013-11-6
In a regular expression, [220] means "match a single 2, 2, or 0". Eliminate the brackets if you want to match a specific sequence:
str = 'Part ID: 112 or Part ID: 220 or Part ID: 252 or Part ID: 106';
exp = 'Part ID:\s+(220)\W';
tokens = regexp(str, exp, 'tokens');
Part_data = reshape(str2double([tokens{:}]), 1, []).'
If you want to match multiple sequences, use something like this:
exp = 'Part ID:\s+(220|252)\W';
  4 个评论
显示 2更早的评论
Kelly Kearney
Kelly Kearney 2013-11-6
There might be a way to do this with a singular regular expression, but I'd just capture them all and then filter out the ones you don't want:
str = 'Part ID: 112 or Part ID: 220 or Part ID: 252 or Part ID: 106';
exp = 'Part ID:\s+(\d+)';
tokens = regexp(str, exp, 'tokens');
Part_data = str2double([tokens{:}]);
Part_data = Part_data(Part_data ~= 106);

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Characters and Strings 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by