A simple regex error

Hi:

I have a simple expression and trying to do a regexp, but it fails. I do not understand why the first regexp fails while the second one succeeds.:

>> str1='peak memory used        124.63 megabytes';

>> tokens=regexp(str1,'peak\s*memory\s*use(\s)*\d')  

tokens =

       []

>> tokens=regexp(str1,'peak\s*memory\s*use(\s)*')  
tokens =

       1

Answer 1

[Andrei Bobrov]

use

tokens=regexp(str1,'peak\s*memory\s*use(\s)*d')

[Bugaboo]

Actually, this works. But I always thought that \d is to match a digit. But it looks like it is "d", instead of "/d". I am bit confused about that. Furthermore, if I change the str1 to following, then the regexp still works where it should not.

>> str1='peak memory used       d 124.63 megabytes';

>> tokens=regexp(str1,'peak\s*memory\s*use(\s)*d')  

tokens =

       1

>> str1='peak memory used       r 124.63 megabytes';
>> tokens=regexp(str1,'peak\s*memory\s*use(\s)*d')  

tokens =

       1

What I want is to find a pattern in a textfile which has been read to buffer and I am looking for a number after (with possibly some whitespaces after) the phrase "peak memory used".

Thanks

[Andrei Bobrov]

Hi Bugaboo!

Please try this is code and read about Regular expression in regexp:

str1='peak memory used     d   124.63 megabytes';
tokens=regexp(str1,'(?<=peak memory used\s*\w*\s*)\d*\.\d*','match');