regexp to capture only certain length of characters

Question

0 个投票

Hi, I'm trying to capture words with 4 characters only. A word consists or alphanumeric characters.(no symbols of white space)

str4='4-44g 4541 75872 a4cd stuvw';
 patt4='(\w{4,4})';
 regexp(str4,patt4,'match')

I'm expecting 4541 a4cd as the correct answer. However my code outputs stuv & 7587 in addition. How can I correct this

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Answer 1

Rashmil Dahanayake 2014-8-7

0 个投票

 This could be the solution
 str4='4-44g 4541 75872 abcd stuvw';
  patt4='\<\w{4}\>';
  regexp(str4,patt4,'match')

Azzi Abdelmalek 2014-8-7

This doesn't work for underscore. For example

str4='4-44g 454_ 75872 abcd stuvw'

Answer 2

Azzi Abdelmalek 2014-8-7

0 个投票

str4='4-44g 4541 75872 a4cd stuvw';
regexpi([' ' str4 ' '],'(?<=[^0-9,a-z])[0-9,a-z]{4}(?=[^0-9,a-z])','match')